The Renogy BT-1 Bluetooth module is a great addition to any compatible Renogy solar system. Capable of connecting to select Renogy charge controllers through the RS232 port, the BT-1 is used to pair charge controllers with Renogy’s remote monitoring app, Renogy BT. Available for smartphones and tablets, Renogy BT allows for remote monitoring and parameter changes directly via the app. Take the guesswork out of system monitoring by using the BT-1 to view real-time performance without having to leave your seat.