Warranty & Compatibility & Note: 12 months worry-free warranty; Compatible with Motorola radios SL300 SL3500e SL7550 SL7550e SL7580 SL7580e SL7590 SL7590e SLN 1000 TLK 100 TLK 110 (SL 300 SL 3500e SL 7550 SL 7550e SL 7580 SL 7580e SL 7590 SL 7590e SLN1000 TLK100 TLK110); 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. 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 tube