The Golisi Needle 2 is a compact charger with 2 slots. It has a USB power port for 1A charge. And it's compatible with almost all types of cylinder-shaped rechargeable batteries. You can charge two batteries at the same time. Parameters Case materials: ABS/PC/Fire proofInput voltage: DC 5V /1AOutput current: 0.5A each slotPower port: USBProtection: Short circuit protection/Over current protection/Reverse connection protection Battery compatibility: Li-ion 18650, 21700, 26650 / Ni-mh / Ni-cd /aaa/ aa (almost all types of cylinder shape rechargeable batteries)Working temperature: 0-40℃ FEATURES LED indicator lightUSB power portMilitary-grade loading springABS/PC fireproof case2 battery slots It comes with 1x Golisi Needle 2 2A USB Charger Only suitable for rechargeable lithium-ion/Ni-MH/NI-CD batteries Keep the charger out of reach of children. Use the device at 0-40℃ temperature range.