・ Switching frequency up to 1MHz ・ Quasi-CV mode to compensate for the voltage loss on the battery's internal ・ Resistance and trace resistance automatic recharge ・ Good adaptability to input supply with limited driving capability ・ With battery overvoltage protection,low voltage protection,and short circuit protection ・ Great for PDA,MP3,MP4,cameras,Bluetooth-compatible applications,games consoles,notebooks,18650 lipo lithium battery,phones,solar charging,audio equipment,POS,electric fan,Type-C charging equipment,etc. Specification: ・ Size:39x18x6.3mm ・ Operating temperature-40 ℃ ~+85 ℃ 2-Cell (2S) 8.4V Version ・ Input voltage:DC 3-6V (Recommend DC 3.7V 5V) ・ Input current:1A (1A Version);2A(2A Version);4A (4A Version) ・ Charging voltage:8.4V ・ Charging current:0.55A (1A Version);1.1A (2A Version);2.2A (4A Version) 3-Cell (3S) 12.6V Version ・ Input voltage:DC 3-6V(Recommend DC 3.7V 5V) ・ Input current:1A (1A Version);2A (2A Version);4A (4A Version) ・ Charging voltage:12.6V ・ Charging current:0.37A (1A Version);0.74A (2A Version);1.48A (4A Version) 4-Cell (4S) 16.8V Version ・ Input voltage:DC 3-6V (Recommend DC 3.7V 5V) ・ Input current:1A (1A Version);2A(2A Version);4A(4A Version) ・ Charging voltage:16.8V ・ Charging current:0.28A (1A Version);0.56A (2A Version);1.12A (4A Version) LED Indicator: ・ "CR":Charging ・ "OK":Fully charged or constant voltage mode Package included: ・1xLithium Battery Charger Module ・1xEnglish User Manual