Description: brand new and high quality Feature: Based on the current scoring for time, accurately calculate the remaining capacity of the battery and the charge capacity. Support for An-droid cellphones to connect Bluetooth-compatible display parameters, set and modify parameters, independent display screen display parameters. The protective board is built-in temperature control monitor, safe and reliable to use. The display screen has the speed testing function, calculate remaining mileage. Set an independent watchdog for real-time detection program plus secondary for protection, never crash. Can lock the battery for not be discharged, modify the Bluetooth-compatible name and password. It can connect with the computer, provide real-time monitoring and better for protection. Over-charge, overdischarge, over-current, short circuit, high-temperature, and static electricity for protection. Easy and simple to connect and install. Specifications: Item Type: for Protection Board Material: plastic+metal Size: protective board: 138x102mm/5.4x4.01in, Bluetooth-compatible module: 50x17mm/1.9x0.6in Color: As shown Optional Type: 1, 4 Voltage/Current: 3.2V/100A, 3.2V/120A, 3.2V/60A, 3.2V/80A Quantity: 1 PC Note: Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes:(Optional) Type 1: 1 x Bluetooth-compatible Module Type 4: 1 x UART Communication board