Supply Voltage:3.7V~5.5V Charging Current:1A(max) BAT Discharging Stop Voltage:2.9V Discharging Efficiency:85%(input 3.7V output 5V/1A) Features: Charging and discharging indication Internally installed charging and discharging power MOS Preset 4.2V charging voltage, precision plusmn;1% Max 8uA standby current Integration charging management and discharging management Intelligent temperature control and overtemperature protection Integration output overvoltage protection,short coircuit protection,overload protection Integration overcharging and overdischarging protection Support trickle mode and zero voltage charging When charging :red light flashing ★Paket yg didapat★ 1 pcs ★5V Boost USB Step Up Lithium LiPo Charging Protection 134N3P PowerBank★