1.hand free,USB jack 2.ISO,CE,ISO9001,bluetooth 3.sensitivity:86db, ... convenience, the 1090 with pendant type microphone If both hands free is what you need, this microphone is perfect. 2.4GHz ... -in-one unit, for revolutionary, cable-free convenience. Feature:1.Portable,convinient,microphone hands free,USB jack2.Certificate:ISO 9001:2000,Rohs ...