Specifications:1. Input voltage and current: DC5V/2A 9.0V/1.67A, beyond this range voltage alarm and stop charging2. Output voltage: 5V/2A 9V/1.2A3. charging power: 10W backward compatible with 7.5W, 5W4. conversion efficiency: 80 percent5. transmission distance: 8MM6. over temperature protection: when the temperature is higher than 55 degree when charging, automatically stop charging for 1 minute, wait for the temperature to drop and then recharge7. Overcurrent protection: When the output current is greater than 2.5A during charging, the charging will be automatically stopped to prevent damage to the charger.8. product weight: 170g