High Strength Connector: With TPU (Thermoplastic polyurethane) rubber jacket, internal hard core and Nickel-plated brass plugs, assembled by precise soldering technology and molding technology, the connector is built for stable connectivity and excellent operating life. Super Strength Cable Module: TPU (Thermoplastic polyurethane) cable bring super bending strength, abrasion resistance and scratch resistance; Cable internally reinforced by high tensile strength fiber and Kevlar fiber bring excellent tensile strength; Strain relief structure made of TPU rubber bring stronger bending strength and longer lifespan; This cable module is built for mission critical use. Clear Sound Transmission: With professional acoustic tube module, high quality micro speaker, high purity copper wire cable and anti-Interference circuit design and our great assembly skills, this earpiece ensure sound to be received clearly even in loud environment. Professional Acoustic Tube Module: Super quality TPU acoustic tube provide durability and flexibility; Ear-hook and elastic coil made by precise forming technology makes your wearing more comfortable; Acoustic tube joints made of anti-cracking & wear-resistant plastic bring reliability and prevent scratching; High performance micro speaker and acoustic tube ensure sound to be transmitted clearly even in loud environment; A variety of accessories meet different ear wearing choice. Warranty & Compatibility & Note: 12 months worry-free warranty; Compatible with All Speaker Mics with 3.5mm Listen Only Audio Jack; Compatible with Speaker Mic of Motorola Commountain Kenwood Baofeng Icom Harris and more; This is not Intrinsically Safe earpiece, Don't use it in hazardous areas; This is not water-proof earpiece, Don't use it under humid environment and rainy day.