At the main page of 'XRecorder', voice recording will start/pause when you press the center button of 'Xelfie Play' or the recording button of 'XRecorder'. [Compatible Device] - For iOS 7.0, 8.0 ※Some models might not be supported. Xelfie operate high electric efficient with latest Bluetooth Tech 4.0 Xelfie is very easy to replace the battery.