4Pcs 18650 Charging Board Dual USB 5V 2.4A Mobile Power Bank Module 186 50 Lithium Battery Charger Board with Overcharge Overdischarge Short Circuit Protection

Dual output current: 5V 2.4A; Input voltage B+ to B-: 3.0 - 4.2V. Note: The positive pole of the battery is connected to B+ and the negative pole is connected to B- do not reverse it. If it is reversed it will burn out! size:6.5*2.5*0.1cm colour:green Material: PC+ metal Package Contents: 4 * Dual USB 5V 2.4A 186 50 Charging Board Only the above package content other products are not included. Note: Light 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.