Connect methods: Wireless Bluetooth Software: For ZELLO Connection distance: 30M Supported operating systems: For Android 4.0 and above, for iOS 8.0 and above Specification: Battery: CR2032 (installation required) Working hours: at least 200 days How to use it: Step 1. Install the battery. Turn this button to remove the chip inside, install the extra battery, and turn the switch next to it to "ON". Step 2. Open the wireless and Bluetooth on the mobile phone. Step 3. Open the Zello app, click "Options", click "Push-to-Talk", click the button and wait for a while. After connection, it will show "PTT-Z01", click "PTT-Z01", choose "Hand to Talk". Step 4. Click the button to make a communication. Material: Plastic Color: Black Package Contents: 1 x Bluetooth PTT Button 1 x Strap Only the above package content; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3cm.