* Transmits to 500m plus in the open using a 9V PP3 battery * Can be received on a standard FM radio * Highly sensitive built-in electret microphone * User adjustable transmitting frequency (just requires a small screwdriver) * Frequency Range: 75-108MHz approx. * Supply: 6-18V DC (9V PP3 battery clip provided) * Current consumption: ~23.5mA @ 9V * Dimensions: 45x19x10mm * Full instructions provided