Completely concealed inside this Coby "Boom Box" radio/CD player is a tiny CCD camera and 2.4Ghz video transmitter. Unit is AC/DC powered. Six "D" batteries will power camera/transmitter for 8 hours. A hidden switch on back of the unit allows you to turn off the camera. All functions of the Boom Box work normally. Available in four different channels, up to four units can work simultaneously. Line of site range is 700 feet. Actual range will vary depending on terrain and ambient RF interference at your location. Unit includes four channel digital receiver, AC adaptor for receiver and RCA connector cable. Also, available in a wired version