EFEST Slim K4 Charger Compatible with: 10440, 14500, 16340, 17340, 18350, 18490, 18500, 18650, 20700, 21700, 26500, 26650 BatteriesNOTE: Batteries are NOT included. Portable Design with Quality Piano Strings Battery Life LED Indicator Light Type-C Charger Input Power: DC 5V 2A 2*1A CC Current: 2000mA (+/-10%) 1*1A CC Current: 1000mA (+/-10%) 4*0.5A/3*0.5A CC Current: <100mA Standby Current: <20mA Activation Current: 50mA~100mA Auto Recharge Voltage: 4.10 (+/-0.10V) Operation Temperature: 0C ~ 40C Storage Temperature: -40C ~ 70C Auto Cut-Off Voltage: 4.20 (+/-0.05V) Includes:1 X Efest Slim K4 Charger1 X Micro-USB Type C Cable1 X User Manual1 X Warranty Card