Features: TP5000 lithium ion battery lithium iron phosphate battery 2A current 4.2 or 3.6V can be switched 2A version is the ultimate performance version of TP5000,due to the larger current, the heat will be relatively large, but the fastest charging speed Parameter Input: 4.5-9V (can not over 9v, suggest 5v-6v) Voltage:4.2V or 3.6V error 1 percent (circuit board default 3.6V) Current:2A(change the sampling resistance can be adjusted, the formula is: 0.1 v or current = resistance) Function:lithium battery or lithium iron phosphate battery charging, full charged, the charging will stop, green LED light up The status indicator light is not welded and the user is required to be welded on their own Size:2.6x1.8cm or 1.02x0.71inch Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 x TP5000 Charger Board