Aluminum Safety Hammmer Car Charger, 3.1A Dual USB Travel Car Charger Auto Adapter for iPhone,iPad,Samsung, Smart Phone,Tablet (Silver) Dual USB Car Charger: 3.1A total output for 2 USB ports, automatically providing optimal charging efficiency(2.1A, Max). Car Charger: allows you to charge mobile phones, tablets, music players, etc. Safety Hammer Function: can be used as emergency escape tool, helping the users broke the car's glasses when they can not open the door. Portable Travel Charger: Universal USB ports are compatible with iPhone, iPad, iPod, Samsung, HTC, MP3 players and all other digital devices with 5V input. Reliable and Safe: with protections against overheating, overcurrent, and overcharging. Charging will stop automatically when battery is fully charged.