The Multifunction Program Box is the equipment for setting brushless speed controllers; it works in the following 3 ways: Works as an individual equipment to set the ESC, the option of each programmable item is displayed on its own LCD screen; Works as an USB adapter to link the ESC with PC to update the ESC firmware or set the programmable item by the USB Link Software on PC. Works as a Lipo battery voltmeter to measure the voltage of the whole battery pack and each cell. Specification: Size: 90mm * 51mm * 17mm Weight: 65g Power supply: DC 4.5V to 12.6V Suitable for the following ESC: XeRun Series Car ESC (Version 2.0/2.1/3.0/3.1 and later) EZRUN Series Car ESC (Version 2.0 and later) PLATINUM Series helicopter/airplane ESC Seaking Pro Series Boat ESC