IDUINO Lithium Battery Charger Board Mini USB 1A18650 5V Module - 2pcs Charging mode: linear charge 1%,Charging current: 1A adjustable Input voltage: 4.5V-5.5V , full charge voltage: 4.2V Working temperature: -10 to +85 Charging instructions: green light---fully charged,red light-charging Package listing: 2 x 1A lithium battery charging board