All British bats and their roosts are protected under UK law and it is an offense to handle or disrupt them without a license. This bat detector from Gardenature can help you determine if bats are roosting before any building development can begin. This Magenta Bat 5 Digital Quartz Bat Detector has a backlit 4 digit LCD frequency display, a high stability easily tuned local oscillator, advanced amplification and filtering circuits. Pick up bat activity in a radius of 100 metres to ensure any disruption or destruction of roosts is avoided and the bats in your areas remain unharmed. Features and Benefits Quartz accurate - Always calibrated and displaying the frequency to within 0.1kHz. Packed full of features - This unit has a front-facing weatherproof speaker, built in LED torch, wrist strap and headphone and recording sockets. Clear display - The large 4 digit LCD frequency display with backlighting is great for easy visibility day and night Specifications Type: Heterpdyne Frequency Range: 10-130 kHz Bandwidth: 9kHz (±4kHz) Outputs: 3.5mm stereo headphone socket and 3.5mm stereo recording socket Output power: 5.5w Tape output 100mV typical Speaker: waterproof low profile mylar Battery powered: 4 x AAA batteries (not included) Multi-stage active filters Wide range equalised microphone Usable radius up to 100 meters Dimensions: H 13.5 x W 7.2 x D 2.7cm Guarantee: 2 years