Item NO. VTB-66 Bluetooth soccer wireless installation. DSP technology,full duplex , noise and echo cancellation,The voice is clear when you talk with your friends. 1600mah Lithium battery Voice dialing, last call redialing, and call waiting function. Built-in high intelligent microphone and powerful speaker. Packing / specification: Number per ctn: 18 pcs / ctn N.W: 7.2 kg / ctn G.W.: 7.65 kg / ctn Measure: 31cm X 31cm X 30cm