1. Bluetooth specification: version 1.22. Frequency: ISM 2,402-2,480GHz3. Support file: hands-free and headset profile4. RF output power: -6~+4dBm5. RF sensitivity: >-75dBm6. Distance: within 10m7. Indicator: LED (blue and red)8. Talk time: 480 minutes9. Standby time: 120hours10. Battery: built-in rechargeable lithium battery11. Transmission power: SBC max. 200kbps, 48,000kHz, 16bit12. Audio code: stereo audio13. Audio frequency range: 20Hz-22kHz14. Audio frequency output power: (RL=32 ohm) 2.5mW15. Temperature: -10癈 to 45癈16. Box dimensions: 14.5 x 10.2 x 5cm (L x W x H)Outer packing:50pcs/ctnCarton dimensions: 75 x 22 x 28cm (L x W x H) producing area:China