A8 3 in 1 Bluetooth Earphone & Safety Hammer & Car Charger, Support Hands-free Call & USB Quick Charger Function 1. 3 in 1 diversified use: Bluetooth earphone & Safety Hammer & Car USB Quick Charger. 2. Bluetooth V4.0 technology: More rapid transmission. 3. Bluetooth earphone detachable, more convenient of use. 4. Built-in Microphone, supports hands-free calls: Answer phone automatically when pick up the earphone from the car charger; and hang up automatically when put the earphone back on the car charger. 5. Using intelligent identification IC, Output 2.4A current stablely, as fast charge 3.0 standard. 6. USB outputs, enrich your needs, It can charge for 5V devices, such as charger for iPhone, iPad, Samsung, HTC, Sony, Lenovo, Huawei, Xiaomi and other Smartphones or Tablet, MP3, MP4, etc. 7. It can be used as emergency hammer to break the car window glass because of the solid stainless steel + zinc alloy material, solid and sharp iron and steel construction. 8. Built-in 30mAh battery, longer work time. 9. Perfect collocation to meet your daily charging needs or emergency lifesaving needs.