The 201-W is our fully wireless IFB designed to use your existing Audio Clarifier. It has a 3.5mm / (1/8") input for a microphone for talkback. You can also order the 201-W with a 3.5mm input instead of the typical snap attachment in the case you want to use it with an electronic IFB. If the device, you want to connect to does not have bluetooth capability. We also have a 201-W version that pairs with a dongle that can be plugged into any Aux/headphone output. The dongle can broadcast to five 201-W receivers simultaneously. Microphone not included.