This smartphone two-way radio Bluetooth PTT (push to talk) product can be interconnected with Android and iOS smart phones. Unlikely other general two-way radio, smart phone can be used as one side of two-way radio. If a smart phone user sets certain environment in Bluetooth setting, he/she can communicate with other users. Sets can be available within 10m distance with smart phones Communications duration: 5 hours Stand by duration: 120 hours Charging time: 2 hours Size: 50.5 x 18 x 12.2mm Weight: 10.3g Battery: 3.7V/80mAh