1、Bluetooth Module: The Bluetooth module is an accessory of the solar controller. When users need to display the operating parameters of the controller through the APP, they need to purchase the Bluetooth module separately. The controller sends the operating parameters to the mobile phone through the blue module and displays them through the dedicated APP. 2、Clear in Display: The Bluetooth module is connected to the solar controller, and the dedicated mobile phone APP can be connected to the charger through Bluetooth to display various charging parameters, historical data and fault information of the charger in real time. 3、Quick Connection: Insert the connecting line of the Bluetooth module into the special Bluetooth interface of the solar controller with Bluetooth communication function, and then fix the module at any position. 4、Reliable Working: The bluetooth transmission distance can get up to 10 meters, and the stable signal ensures faster response and easier control. 5、Premium Material: Adopting premium ABS material, the Bluetooth control module is not likely to malfunction, and very durable for long use. Item Type: Solar Charge Controller Bluetooth Module Material: ABS Working Voltage: 5V, provided by the controller. Model: BT10 Bluetooth Version: 4.2 Bluetooth Distance: <10m / 32.81ft Interface tType: XH2.54-4P APP: for Charge Connect Function: Bluetooth module. Weight: 89 g / 3.14 oz(approx.) 1 x Solar Charge Controller Bluetooth Module 1 x User Manual