The earpiece is made of durable PU material Soft silicone ear bud to fit snuggly in your ear and clear sound performance For two-way radios, CD Player, MP3 players and similar devices with 3.5mm right angle plug 100% compatible with all original equipment manufacturer (OEM) parts Please make sure to avoid the product getting wet or use the product in moisture condition. If it stops working, it’s because there’s moisture inside the tube. Blow the tube to make the moisture out of the tube and the earpiece will work perfectly Experience crystal-clear audio with the KS K-STORM 1 Pin 3.5mm Receiver/Listen Only Surveillance Acoustic Tube Earpiece. This durable, in-ear headset is crafted with a soft silicone ear bud for a snug fit and features a tangle-free cable for hassle-free use. Compatible with a wide range of devices, including two-way radios, walkie talkies, and MP3 players, it ensures clear sound performance. The earpiece is made of robust PU material, making it suitable for professional or communication use. Please note that it is not water-resistant, so avoid using it in moisture conditions. The earpiece comes in a sleek matte black and white color, packaged in a standard pack with one count. It is backed by a 1-year manufacturer warranty.