Frequency band: 2.4 ghz to 2.483ghz, one sm band Talking time: up to six hours Standby time: up to 150 hours Operating distance: ten meters(class 2) Charging time: within three hours Dsp: full duplex transmission, noise suppression, and echo cancellation. Signal-to noise: > 60db with 15bit sound effect decode Bluetooth profile support: compatible with bluetooth enabled devices, including mobile phone, pc, pda, printer, and more Certification: ce, fcc, and bqb Specifications: Talk time: up to four hours Standby time: up to 70 hours Weight: 11g Components: Obluetooth headset Travel adapter User manual