1) Bluetooth wireless technology allows you to connect compatible communication deviceswithout cables. 2) A Bluetooth connection does not require that the phone and the headset be in lineof sight, but both devices should be within 10 meters (30 feet) of each other.Connections can be subject to interference from obstructions, such as walls,or other electronic devices. 3) The headset is compliant with the Bluetooth specification 1.2 supporting the followingprofiles: Headset profile. Interoperability between the headset and otherproducts with Bluetooth technology is not guaranteed. Check with the manufacturersof other devices to determine their compatibility with this device. Colors Available : Black Type of Packing : Color Box Package Includes : User Manual , Charger , Lanyard Packing Information : Q'ty/Carton : 40 pcs Carton G.W : 4.72 kgs Carton Size (L * W * H) : 37 cm * 37.5 cm * 40 cm producing area:China payment:T/T, Western Union supplying capacity:30,000 pcs