NEXTAV Wireless Bluetooth PTT Button for iPhone iPad iOS (Android/BLE) ZELLO APP with fastener Strap Sport Design (Model Z) Leave your phone in the pocket and activate the Zello Push-To-Talk function wirelessly Easy to use - ON/OFF POWER SWITCH. NO PAIRING LIGHT. Pair within Zello App Includes one CR2032 coin cell battery (already installed, just turn on power switch when ready to use) NO CHARGER NEEDED. Simply unscrew to easily change the CR2032 coin cell Super light (0.3 OZ) and small (1 inch in diameter). Easy to carry