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 (requires installation) Working hours: at least 200 days How to use: 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. Enable 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. Once connected, it will show "PTT-Z01". Select "PTT-Z01" and choose "Hand to Talk". Step 4. Press the button to communicate. Material: Plastic Color: Black Package Contents: 1 x Bluetooth PTT Button 1 x Strap Note: Only the items listed above are included. Other products are not included. Light reflection and different display settings may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.