Connect methods:Wireless Bluetooth Software:For ZELLO Connection distance:30M Supported operating systems:For Android 4.0 above,for IOS 8.0 above Specification: Battery:CR2032(need install) 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 wait for a while,after connect it will show "PTT-Z01",click "PTT-Z01",choose "Handto Talk Step4.Click the button to make a communication. Material: plastic colour: black Package Contents: 4 x Bluetooth PTT Button 4 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.