W900-BLTM Features: -Switchable between 4 frequencies: Blue – 72.500 MHz, yellow – 72.100 MHz, green – 72.900 MHz and orange – 74.700 MHz. -Superb sound without cords or wires and no interference from other electronic equipment. -Operates on dedicated channels. -Listen with an infinite number of headphones on one frequency with one transmitter. For Use With: -Hamilton Buhl Wireless Headsets. Connecting Types: -Bluetooth. Global Product Type: -Transmitter. Dimensions: Overall Height – Top to Bottom: -4″. Overall Width – Side to Side: -9″. Overall Depth – Front to Back: -9″. Overall Product Weight: -0.65 lbs.