SONY ECM-AW4 Unused item. I purchased it new, but ended up not using it, so I'm putting it up for sale. A wireless microphone that can be used by connecting to video cameras equipped with a microphone input terminal, IC recorders, and other recording devices. ● By connecting the receiver and the recording device, you can have a conversation using the earphones connected to the recording device and the earphones connected to the microphone. ● Volume button for adjusting the volume of the earphones. ● Can record the audio from the microphone side (audio from the receiver side cannot be recorded). ● Continuous talk time: Approximately 3 hours (with Sony alkaline batteries, at a temperature of 25 degrees Celsius) ■ Wireless Microphone Maximum external dimensions (approx.): Width 19mm x Height 66mm x Depth 30mm, Weight (approx.): 19g