Use your radio with apps for over-the-air messaging like Rattlegram or AndFlmsg or for location reporting like APRSdroid (Android) or APRSpro (iOS). You can also use it to send pre-recorded sounds over the air with your radio. Compatible with the Baofeng UV-5R and other radios with the Kenwood K plug. Requires 3.5mm audio input/output jack on smartphone, tablet, or computer. Reversing connector adaptor included for use with select devices. Add a Lightning or USB-C adapter as needed for your device.