Features: Trace and locate underground wires or in-wall wires. Enable cables to be located before drilling. The detection range is 3-feet and cable length 3000-feet. Equipped a pair of 3.5mm earphones that can be connected the the receiver earphone jack to improve efficiency in a noisy environment. Designed with white LED flashlight for auxiliary lighting in the darkness. Can adjust the transmitter and receiver controls to move further distances according to the wire depth. Specifications: Material: ABS Earphone: 3.5mm earphones TRANSMITTER: Tone Frequency: 200kHz Max. Working Current: Less than 70mA Max. Signal Voltage: 15VP-P Signal Display: Tone Power Supply: 1 * DC 9V NEDA 1604/6F22 battery (NOT included) RECEIVER: Frequency: 200kHz Max. Working Current: Less than 70mA Earphone Jack: 1 Power Supply: 1 * DC 9V NEDA 1604/6F22 battery (NOT included) Packing List: 1 * Transmitter 1 * Receiver 1 * Earphones 1 * Pouch 1 * Manual (English)