Ishii JW-720STA 28 1/4" Big Clinker Tile Cutter UNIVERSAL 510 THREADCompatible with eGo series and other 510 thread HIGH capacity batteries. CHARGING INDICATORRed indicator means your device is charging, and green indicator means your device is fully charged ULTRA-SAFE & SMARTBuilt-in Over-Voltage Protection, Over-Current Protection, Over-Charge Protection and Short-Circuit Protection to ensure safely charge. After fully charged, it will quit charging automatically. SPECIFICATIONS.2 PCS, Input 5V/500mA, Output 4.2V/420mA. Warm Tips: The input Voltage/Current are not allow to exceed 5V/1A, which means you can not use fast charger to power it. AFTER-SALES SERVICE2 month refund, 1 year warranty. Professional after-sales team provides free life-time technical support. You can apply for service support with your order ID