Vktech Cell Phone Calls Recorder with Playback Dictaphone for iPhone 4S 5 5S (Black) Stand alone, no need install APP on iPhone, record calls in flash memory of device With Playback, can check the recorded call on device Built-in 512MB memory, can record about 500 minutes calls Can connect to computer with USB cable, to take out recording files, save or edit on computer Power supply: Built in 110mAh Lithium battery