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 BH-802 headset is compliant with the Bluetooth specification 1.2 supportingthe following Profiles: Headset profile and Hands free profile. Interoperability between the BH-802headset and other products with Bluetooth technology is not guaranteed. Checkwith the manufacturers of other devices to determine their compatibility withthis 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 : 4.92 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