ITEM NAME:2S Lithium Input Output Protection Board PCB 7.4V 3A for Arduino (Pack of 2 W7B1 2S Lithium Input Output Protection Board PCB 7.4V 3A for Arduino (Pack of 2 W7B1 Material: metal color:blue Working Current: 3A Voltage: 7.4V / 8.4V Package Contents: 2x battery pack protection board Note: Light shooting 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.