Check the listing for details. Azden Wireless Mic, Receiver Bundle for Video or PA Systems. Condition: Used. Listed at 119.00 USD. I am the original owner of this Azden wireless microphone bundle. I primarily used it for doing vacation videos. I found that without an external mic it was sometimes difficult to hear what someone was saying especially in noisy environments. All devices work together however you can only have 2 mics working at the same time as the receivers have only 2 channels. The mics do not need to connect to a camera but can also connect to any audio amplification system (PA) that has a plug for external input. The mics have a range of about 150-300ft depending on the terrain. The WR22-PRO has a lower output signal that might not work well with an earpiece. Sound is crisp and clear. Items included are: 3 transmitters each with a lavalier microphone, with windscreens, one transmitter is missing the belt clip, and one mic is missing the tie clip. All work fine 1 Handheld microphone 3 Dual channel receivers with mini plug cables plus one has an earpiece to listen to audio coming over mics. 1 Headset with boom microphone that allows you to listen and comment. Note: Batteries are not included. Devices use 9V or AA