Optimize product title: Wireless Bluetooth Headset with 50mh9 Battery Life

Product information:
Driver: 40mm
Impedance: 32 OHM
Bluetooth version: Bluetooth v4.2
Bluetooth usage frequency band: 2.4GHz
Power level: Class II
Bluetooth distance: barrier free 10 meters
Frequency response: 20-20000Hz
Charging time: about 2 hours (power indicator charging: red light on, fully charged: red light off (blue light on).)
Call time: approximately 8-10 hours
Music time: approximately 8-10 hours
Standby time: approximately 120 hours
Battery capacity: 250MAH+protective board
Charging power supply: DC5V power supply [round hole interface] (computer USB port, mobile phone charger, car charger)
Compatible phones: 99% of phones with Bluetooth functionality compatible with Android, Apple, Microsoft, and Symbian systems