Product description: 18650 boxes,2 4.7V, battery pack, battery, lithium battery, 18650 Box material: soft PP material Spring: nickel plated steel Rivet: Brass Wire: 1007# 24AWG Exposed wire length: 150mm(red and black cable) Color: Black External connection: two 150mm red and black cable Remarks: 5 pack of 18650 lithium battery. After the series output 7.4V. is installed on the battery, please do not touch the red black line.The screw can be fixed,and Screw not included