This is the Hobbywing ESC programmer. It includes a built in battery checker and is compatible with the new G2 series of ESC from Hobbywing. User Manual: Click here. 2X MORE Memory SMART ESC Programmer LiPo Battery Voltmeter USB Adapter for PC connection Overview This multifunction program box is for programming HobbyWing brushless ESCs. Its friendly LCD interface makes ESC programming easy and quick. With you PC, you can upgrade ESC firmware and further adjust ESC parameters online. Besides, it’s compact, portable and very applicable for field use. This multifunction LCD program box is applicable to the following HOBBYWING products: PLATINUM series of brushless aircraft ESCs, XERUN series & EZRUN MAX series of brushless car ESC, SEAKING Pro series of brushless boat ESCs Note: USB Software works for PC users ONLY. WiFi Express Module works for both Apple and PC users Specifications Size:91x51x17mm(LxWxH) Weight:65g Input Voltage: 4.5V—12.6V (a separate battery is needed for powering this program box when ESC has no built-in/external BEC) Interface: Micro USB ESC interface (Futaba plug) Power supply interface (Futaba plug)