Specifications: Headset Bluetooth version: Bluetooth 4.0; Bluetooth transmission distance: 10 meters; Bluetooth frequency: 500 Hz; Bluetooth module: CSR BC8. Headphones diameter: 23 mm; Battery capacity: 40 mAh; Talk Time: 4 hours; Standby time: 96 hours; Function: play music, voice calls, charging quickly. Oxygen bar: Input voltage:-1.5KV~3.5KV; Power: <1W; Anion concentration: 3000000~10000000/CC. Car charger: Input voltage:12V; Output voltage:5V; Output current:3A max.; Main Feature: Safer Call: A Bluetooth headset with oxygen bar. Make your driving safer and healthier. Health Call: Oxygen bar can release more than 3~10million ions and makes your driving healthier. Strong compatibility: Healthy call is compatible for most mobile phones and tablets. Healthy call can be paired with two phones.