D9 for Smartphones Headset Headphone

Specifications:
Color: Silver
Material: ABS + Wire
Bluetooth version: 4.1
Transmission distance: 8 meters
Bluetooth frequency: 2.4G
Bluetooth protocol: HSP1.2, HFP1.6, A2DP1.2, AVRCP1.4
Transmission frequency: 20Hz-20KHz
Wear way: Hanging type
Voice prompts: Chinese and English (long press for 5 seconds to open, and press one time again to switch)
Waterproof: Sports waterproof degree
Power supply: built-in 70mAh lithium battery
Charging mode: USB micro charging
Input voltage: DC 5V
Talking time: 4 hours
Standby time: 100 hours
Charging time: 1-2 hours
Product Size: 29 * 19 * 19mm