Sharper Image SBT517BKBK Bluetooth Earbuds with Microphone, Tangle Free Flat Cable, Noise Isolating, Black Step it up with these stylish Bluetooth earbuds that allow you to listen to music and control playback wirelessly. The in-line microphone keeps your calls hands-free, with the added convenience of voice prompts and talking caller ID. its multipoint connectivity lets you connect up to two phones simultaneously, and the rechargeable lithium-ion battery provides up to 4.5 hours of talk and play time. Features: Noise isolating. Tangle free flat cable. Built-in microphone. Bluetooth wireless. Talking caller ID and voice prompts. Multipoint connectivity. rechargeable via USB cable. 4.5 hours of talk/play. Technical specs: Frequency range 20-20khz, sensitivity 101.3dB, impedance 16 ohm, unit driver 9mm.