This is an optional M2C Racing Aluminum LiPo Receiver Battery Tray Retainer, and is intended for use with the Mugen MBX7 1/8 buggy. This retainer was developed specifically for the ProTek R/C LiPo Receiver Battery (PTK-LP-RX2300-L-2S). It secures the battery in the tray and prevents the battery from being ejected even in the worst crashes. It also allows you to easily remove the battery for charging when needed.
NOTE: This is only recommended for use with the ProTek R/C PTK-LP-RX2300-L-2S LiPo Battery.