The boost power module can be widely used in PDA, MP3 player, MP4 player, digital camera, game console, notebook computer, mobile phone, solar charging, audio equipment, portable equipment, POS, electric fan and other TYPEC charging equipment for battery over voltage protection, battery voltage lower than input, battery short circuit protection. 'CR' LED is the charging status indicator; 'OK' LED is fully charged or in constant voltage mode. Lithium Battery Charger Board Charging voltage: 16.8V Charging current: 0.56A Operating temperature: 40C85C Style: 4S 2A Input voltage: DC36V Input current: 2A Total Size: 39mm x 18mm x 6.3mm / 1.54 x 0.71 x 0.25 inch (L x W x T) Package contents: 3pcs x Step Up Charger Board Battery charging protection board has performance, easy to understand, convenient to install and operate, good adaptability to input power with limited driving capacity, wide application. 1.Connect input power 2.Adjust output voltage 3.Connect load