One CC BEC receiver battery eliminator (voltage regulator).
SPECS:
Length: 1.2" (30mm)
Width: .6" (15mm)
Height: .4" (10mm)
Weight: .4oz (11g)
Input voltage: 5V to 25.2V (2S to 6S LiPo)
Current output: 10A Peak
Programmable Output: 4.8 - 9.0V (Requires Castle Link or Field Programmer)