RF characteristics: 1) Bluetooth frequency use 2.4GHz ISM (industry, science, medical) band 2) Transmit power accord bluetooth class 2 spec. Technical features: 1) 90-degree tilting plug-in 2) High efficient speaker 3) One-touch button to answer / end calls Features: 1) Supports Bluetooth handset and hands free profile 2) Built in echo cancellation and noise reduction 3) Auto answer or no auto answer choice 4) Voice dialing (by Mobile phone function) 5) Caller ID display (LB800D007) 6) Volume control 7) Last number redial 8) External microphone Inner packing: Color box dimensions: 34.2 x 15 x 6.5cm Outer packing: 10pcs/ctn Dimensions: 36 x 32 x 34cm G.W.: 6kg