brand new and high quality Features:Protective board has already set the correct parameters according your needs firstly,and you don'for t need to set it again.High accuracy, low energy consumption,equips with charge and discharge tube,UART communication interface,high integration intelligent lithium battery BMS.This protective board is equipped with bluetooth,you can connect with Bluetooth-for your phone to test it.7-10 sections electronic series connection for protection;various for protection functions of charging and discharging;intelligent balanced operation of electronic chip,flexible to adjust balanced current according to external components.Temperature for protection in charging or discharging;hardware over-current,short circuit protective treatments.All of protective delay can be set by programming,standard UART interface,and accurately report current battery information.Upper computer software support,flexible to adjust various protective parameters of protective board.Sleeping mode,flexible to control static-current consumption,Protective Board with Bluetooth-compatible Module only,other accessories demo in the picture are not included Specification:Type: Voltage RegulatorAccuracy: 0.001VApplication: 14S Intelligent BMS systemProtective Board Size: app.14x6.2cm/5.51x2.44inBluetooth-compatible Module Size: app.17.4x50.3mm/0.69x1.98inQuantity: 1 Set Note:1.No retail package.2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes:1 Set x Protective Board with Bluetooth-compatible Module