GameSir G8 Plus and a Phone Cooler: Measure Fit Before You Buy

The GameSir G8 Plus specification refers to device length, not the space behind an installed phone. Measure that rear area with your phone and case in the controller before buying a cooler.

The G8 Plus length range does not certify cooler clearance

The original Bluetooth GameSir G8 Plus accepts devices 110–215 mm long, according to GameSir’s G8 Plus product article. This specifies compatible device length; it does not verify rear clearance or cooler fit. Check the assembled phone and controller before buying.

Check two things before buying a cooler. Confirm your phone’s length, including any case, in the G8 Plus. Then install the phone and find where a magnetic cooler would touch the phone or case. The KryoZon K12 specifications list MagSafe or adhesive-magnetic-ring attachment, not a G8 Plus installation result.

Set up the G8 Plus as you play, then view the rear and both edges. Note the open area for the cooler and any controller parts that cover it. Repeat the check with your usual case. Rear and side photos document the arrangement, but not the dimensions of a specific phone-controller combination.

Keep product generations separate when using reference images. A listing photo may show another grip design or a bare phone. Use photos of the original Bluetooth G8 Plus as a visual reference, then compare them with your assembled controller. In GameSir’s article, 110–215 mm refers to devices held by the original controller.

Four clearances to check before choosing a G8 Plus cooler

Check whether the grip, controller body, or cable path leaves room for a rear-mounted cooler. The supplied specifications do not confirm a conflict. Check the assembled controller rather than treating the GameSir length specification or K12 attachment specification as a fit diagram.

Clearance 1: usable rear contact space. With the phone locked into the G8 Plus, identify the unobstructed area on its back. For the K12’s magnetic attachment, that position must work with the phone’s MagSafe connection or an adhesive magnetic ring, as described on the K12 product page. Its published weight of 65 g does not state the cooler’s width or the contact area required by your installation.

Clearance 2: grip and crossbar interference. View the fully seated phone from behind. Check whether controller parts occupy the selected K12 position or block access while installing and removing the phone. Measure the gap at the intended mounting point on the assembled setup, not across an empty controller.

Clearance 3: installed stack thickness. Compare the setup with and without your everyday case. A camera bump, case lip or adhesive ring can change the K12 contact point. Neither the G8 Plus device-length listing nor the K12 attachment listing states a combined case-thickness allowance. Mark this clearance unknown if you cannot inspect the installed stack.

Clearance 4: power-cable exit. The K12 uses a Type-C connection and calls for PD 5 V / 3 A power in its published specifications. Map the cable path from the chosen mount position to the power source. Keep it clear of the G8 Plus grip and the phone installation path.

Clamp and side-mount options need photo checks before ordering

A clamp-style cooler, a magnetic cooler on the phone’s back and a side mount each interact differently with the G8 Plus. The K12’s listed methods are MagSafe or an adhesive magnetic ring. The supplied specifications do not identify a detachable K12 clip or confirm use with a G8 Plus bracket. Do not assume a clip or bracket is included unless the seller documents the exact parts.

Use the table to check photos of three proposed mounts; it does not document tested G8 Plus fits. “Side mount” is a proposed arrangement; the supplied sources do not verify a custom K12 installation.

For a rear-mounted K12, photograph the installed G8 Plus from behind and from the side at the proposed contact point. Include the planned cable route. A ruler in the same plane can show the relevant space. An empty-controller photo shows the shell, while an installed phone and case show the mounting area. Send both views to the seller.

The official K12 page lists a 65 g weight and magnetic attachment; these are not clamp dimensions. For a clamp accessory, request jaw dimensions and an installed photo. For a custom bracket, request a photo of the complete G8 Plus, phone, case, bracket, and cooler. Use the assembled view to assess the phone-back position, grip, and cable route.

When comparing listing photos, match the original Bluetooth G8 Plus, your phone orientation, the presence of a case and the proposed cooler position. Photos of other controller variants can identify parts to inspect, but they do not show the original G8 Plus’s available space. GameSir’s 110–215 mm listing identifies device length, even in a third-party installation photo.

What the K12 specifications say about mounting and power

The KryoZon K12 Ultra-Light Magnetic Phone Cooler is a magnetic semiconductor TEC accessory weighing 65 g. Its listed power is 15 W (5 V / 3 A), noise is 32 dB, and connection is Type-C. According to the official K12 specifications, it attaches through MagSafe or an adhesive magnetic ring and requires PD 5 V / 3 A. Those details cover mounting and power requirements.

Methodology: Product specifications come from the supplied KryoZon K12 product master and official product page. The available source does not report test conditions for the 32 dB figure. The right-hand column identifies purchase checks, not measured G8 Plus fit results.

The supplied K12 specifications do not list cooler width, depth, or installed protrusion. A 65 g weight does not reveal those dimensions. When clearance behind the phone and grip is tight, treat listing photos as illustrations rather than measurements.

The K12 product page lists MagSafe or an adhesive magnetic ring for attachment and requires PD 5 V / 3 A. Check your phone and case for a suitable attachment point, and ask the seller for physical dimensions or current ordering information before buying the combined setup.

A documented dry run makes the buying decision clearer

Document the G8 Plus setup with rear and side photos. GameSir lists a 110–215 mm device-length range, while the K12 page lists attachment and power details. Assemble the phone, case, and original Bluetooth G8 Plus, then record the rear areas and cable route visible in your layout.

1. Photograph the installed phone. Take rear and side photos of the G8 Plus with the case you normally use.
2. Mark four checks. Note the possible K12 contact point, nearby controller structure, case profile, and proposed Type-C cable exit.
3. Request missing dimensions. Ask for the K12’s physical measurements and an accessory-specific installed view when the available space is close.
4. Keep the decision conditional. Buy for the proposed arrangement only after your measured space and the seller’s relevant dimensions allow an assessment.

The supplied material includes no measured assembly test of the original G8 Plus and K12. Photos from another owner, including custom-mount photos, do not measure the space around your phone, case, and controller.

If your layout supports a rear magnetic position, verify the K12’s current attachment and PD 5 V / 3 A requirements on the official product page: Source Confirm the contact area and cable route before ordering.

Frequently Asked Questions

Does a phone within the G8 Plus length range have room for a cooler?

No. GameSir lists 110–215 mm for the original Bluetooth G8 Plus's supported device length. Measure the back of your phone with its case installed, since that is where the cooler mounts.

Has the KryoZon K12 been measured on an assembled G8 Plus?

No supplied source documents a G8 Plus with the K12 installed. The G8 Plus length listing and K12 product specifications cover each product on its own. The cooler's physical dimensions are not listed.

Can I attach the K12 using a G8 Plus clamp or side bracket?

The K12 listing specifies MagSafe or an adhesive magnetic ring, not G8 Plus bracket compatibility. A custom side mount depends on the parts used and the clearance available.

What power and cable space should I plan for?

The K12 specifications list Type-C and require PD 5 V / 3 A. Check the cable exit and grip position with the G8 Plus and phone assembled; the supplied K12 specifications do not document the cable route.

Written by Wayne Wei

Co-founder of KryoZon. With a background in semiconductor cooling and consumer electronics, Wayne Wei tests every product in real-world scenarios — from marathon gaming sessions to 4K video renders — so you get cooling advice grounded in data, not marketing.