Bar Fly 4 Prime Bike Accessory Mount is the ultimate in function and utility. This aluminum mount is CNC machined from extruded 7075 aluminum make Prime strong, and its ultra-stiff design makes it the best mount for your computer and heavy light or camera. BF4 PRIME holds your computer out front and center for optimal viewing and aerodynamics. In addition, it will hold a light or camera compatible with a GoPro base, or a Di2 / EPS Junction Box. Compatible with large computers like Garmin 1000 series and Wahoo Elemnt / Roam. Use this computer mount as a Garmin bike mount or a Wahoo mount. Smaller computers will fit but will not be close to the handlebar. Included GoPro base holds light or camera with compatible adapter. Hammerhead computers fit Garmin head. Newer Pioneer computers fit Wahoo head. Reach is long enough for large computers (Garmin 1000 series, Wahoo Elemnt/Roam). Flip the Position Plate around to hold smaller computers closer to the handlebars. BF 4 Prime offers 2 computer mounting positions, making it compatible with the largest computers, and holding smaller computers close to your handlebar. Included GoPro base holds cameras or lights with compatible GoPro adapters. 4 Prime is compatible with the following computer brands - Garmin, Hammerhead, Wahoo, Polar, Mio, Magellan, Cat Eye, Bryton, Joule and (optional) Lezyne. BF4 MAX includes a Junction Box mount if you have electronic shifting. The bike mount attaches to the underside and holds the Box with 2 silicone bands. This accessory cannot be used simultaneously with the GoPro base. Some bike light companies include a GoPro adapter, others offer it as an option.