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.