Feature:1. Trace and locate underground wires or in-wall wires.2. Enable cables to be located before drilling.3. The detection range is 3-feet and cable length 3000-feet.4. Equipped a pair of 3.5mm earphones that can be connected the the receiver earphone jack to improve efficiency in a noisy environment.5. Designed with white LED flashlight for auxiliary lighting in the darkness.6. Can adjust the transmitter and receiver controls to move further distances according to the wire depth.Specification:Specifications:Material: ABSEarphone: 3.5mm earphonesNet Weight: 273g / 9.64ozTRANSMITTER:ToneFrequency: 200kHzMaximum Length Distance: 500m / 1640.42ftMaximum Depth Distance: 50cm / 1.64ftMaximum Working Current: Less than 70mAMaximum Signal Voltage: 15VP-PSignal Display: TonePower Supply: 1 * DC 9V NEDA 1604/6F22 battery (NOT included)Transmitter Size: 134 * 49 * 33mm / 5.28 * 1.93 * 1.30in Transmitter Weight: 75g / 2.64ozRECEIVER:Frequency: 200kHzMaximum Working Current: Less than 70mAEarphone Jack: 1Power Supply: 1 * DC 9V NEDA 1604/6F22 battery (NOT included)Receiver Size: 163 * 40 * 27mm / 6.42 * 1.57 * 1.06in Receiver Weight: 101g / 3.56oz.Package List:1 * Transmitter1 * Receiver1 * Earphones1 * Pouch1 * Manual (English)