Features 1、FUNCTION: BT module can be used with cell phone APP to realize the functions of wireless monitoring, parameter design and data viewing, with simple settings. 2、HIGH PERFORMANCE AND LOW POWER CONSUMPTION: Adopting high performance and low power BT special chip to bring you a good using experience. 3、ADVANCED TECHNOLOGY: This BT module adopts the latest BT technology and BLE technology, featuring fast communication and strong anti interference ability. 4、POWER SUPPLY: This BT module does not need to use external power supply, power supply directly from the RJ12 communication port power supply, very convenient. 5、COMMUNICATION DISTANCE AND APPLICABLE MODELS: The communication distance of this BT module is up to 15 meters. And this BT module is suitable for ML series MPPT 20A 30A 40A 60A solar charge controller. Specifications Item Type: BT Module Material: ABS Weight: Approx. 167g / 5.9oz Applicable Models: For ML Series MPPT 20A 30A 40A 60A Solar Charge Controller Communication Distance: 15m / 49.2ft Package List 1 x BT Module 1 x Instruction Manual