This module is an external DC-DC booster; it draws DC voltage from 1S Li Po battery, boosts it to 6V for your receiver & servo, and keeps providing the stable output current of 3Amp or above. As the BEC voltage of 1S Li Po, which used by 1/12th scale race cars, usually goes below 4.2V and causes the receiver and servo to work abnormally, so a separate battery is needed to power the receiver. This booster can work as a receiver battery and save you the trouble of battery charging and maintenance.
Input Voltage: 1S LiPo，3-4 cell NiMH
Output Voltage: 6V
Output Current(Cont./Peak): 3A/6A
Size: 28.0x26.8x11.8mm (LxWxH)