18650 Charger Board:The module is a portable backup power source that charges the internal battery. Size: 69x 24mm Protection:Overcharge protection, overdischarge protection and short circuit protection. Charging cable:Support three USB data cable charging,useful and convenient. Note:The positive electrode of the battery is connected to B+, and the negative electrode is connected to B- (do not reverse) Support three USB cable charging; Working temperature:-5~45℃; Detection delay time:Less than 200ms Max continuous charge current:1.5/2.4A; IR of PCM:≤65 mΩ Allow 0V change; Constant current:2.4A Dual output current: 5V 2.4A Input voltage B+ to B-: 3.0 - 4.2V Normal current consumption of PCM: Max 60uA; Stanby current consumption: Max 50uA; Overcharge protection, overdischarge protection, short circuit protection. 18650 battery is recommended Note: The positive electrode of the battery:connect to B+, the negative electrode:connect to B. Flip it, it'll burn. Color: As Shown Material: PCB Package Contents: 6 x 18650 Charging Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.