The new and improved Renogy Adventurer-Li adds two great features. The first is Lithium battery charging capability. The programmable Lithium charging voltage allows the Adventurer-Li to charge most Lithium batteries on the market. The second is the RS232 port that is used to communicate with the new Renogy BT-1 Bluetooth module. The Bluetooth module will be used to pair the Adventurer-Li with the upcoming Renogy APP. The Renogy Adventurer-Li is a 30A PWM solar power charge controller that is designed to be used with 12V or 24V photovoltaic systems. This advanced negative-ground controller is designed for aesthetically clean flush mounting on RV or camper walls, however if flush mounting does not appeal to you, the included Adventurer-Li Surface Mount Attachment give you the option to forget it. Integrating highly efficient PWM charging, the Adventurer-Li increases battery longevity by regulating the charge flowing from the solar panels to the battery bank. It features an LCD screen for displaying system operation information and data, and allows for full control of parameter settings. This charge controller comes equipped with a fully comprehensive self-diagnostic system and electronic protection functions to prevent damage from installation mistakes or system faults.