Warranty & Compatibility & Note: 12 months worry-free warranty; Compatible with Kenwood radios NX TK series; Including NX-200 NX-200G NX-210 NX-210G NX-300 NX-300G NX-3200 NX-3300 NX-410 NX-411 NX-5200 NX-5300 NX-5400 TK-2140 TK-2180 TK-3180 TK-5210 TK-5210G TK-5310 TK-5310G TK-5220 TK-5320 TK-5330 TK-5410 TK-5430 TK-290 TK-390 TK-380 TK-385 TK-480 TK-481 and more. This is not Intrinsically Safe earpiece, this is not water-proof earpiece. 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. Clear Sound Transmission: With professional acoustic tu