Professional UHF Transmitter High power, professional UHF transmitter working 60 hours, transmission of range of up to 3,280 feet and its highly sensitive able to catch even the slightest whispers in a room, makes it the most wanted equipment for surveillance. Key Benefits Transmitting range: up to 1000 Meters (one half miles) in open space Voice sensibility: up to 32 feet CR2450 battery: 60 hour The spy bug microphone is used when someone wishes to listen a person or a group without them to know, with the purpose of finding information that could not be found in other ways, or just for surveillance. It can be also used to transmit from an exam classroom/ or other similar situations It will be put in a hidden place inside a room, like under the bed, under a desk, inside a toy or other object, after the battery will be inserted in its place. It will capture the sounds in the room and transmit them to a UHF FM transceiver, to a distance of up to 1000 meters in open space. Note: You will need a UHF FM transceiver or a FM scanner in order to receive this UHF spy bug transmitter. Product specifications Power source 3 Volt battery CR-2450 Autonomy 60 hours Antenna impedance 50 Ohm included Frequency stability PLL crystal quart Frequency 416 – 450 MHz, more channels available We will include a Free Battery with your order Free Shipping Professional High Quality Device Purchase Today (Limited Supply)