1.Handle handset shell using a special PC / ABS plastic; 
2.The surface of handle hndset is made of matte surface, look beautiful, durable, feel comfortable. 
3.Handle handset made of split structure (composed of the up-and-down handle handset), sealing, flame retardant. Withstand the percussion is not broken, twisted pull no distortion, no burst at minus 40 degrees. 
4.metal armoured cord use imported 304 stainless steel, has a strong tensile strength.
5.Built-in high strength tensile steel cables, handle tensile strength ≥250Kg. (Spring wire optional) 
6.Use anti-puncture, hi send, receiver, to ensure the transmission characteristics matching the phone call, in line with requirements of 4.2 GB / T15279-2002's.