Renogy Adventurer Li 30A 12V/24V Negative Ground PWM Flush Mount Charge Controller w/LCD Display Compatible with Lithium, Sealed, Gel, and Flooded batteries and Renogy Bluetooth Module Compatible with 12V and 24V system; Deep cycle Sealed, Gel, Flooded and Lithium battery option ready. The Adventurer is a negative ground controller. This ensure compatibility with any negative ground system, which is the standard and most conventional way of grounding. Any negative connection on the solar module, battery and load can be safely earth grounded as required. Smart 4 Stage PWM charging (Bulk, Boost, Float and Equalization) and temperature compensation increases battery life and improves system performance. Intelligent protection against: reverse polarity, overcharging, short-circuit and reverse current. Backlit LCD screen for displaying operating information and error codes. 5V 2.4A USB port on the front display can be used to charge mobile phones, tablets, speakers, etc. RS232 port allows communication with BT-1 Bluetooth module and usage of Renogy BT smartphone app. Designed to cleanly flush mount on walls, providing a sleek, integrated look. An included Surface Mount Attachment allows for versatility in mounting. Capable of connecting to select Renogy charge controllers through the RS232 port, the BT-1 is used to pair charge controllers with Renogy&#039;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.