Features: The sensitivity of the receiver can be adjusted manually or automatically. The transmitter has a self-test function, and both the transmitter and receiver have a mute function. Compact, rugged and easy to carry. The transmitter has a built-in DC / AC voltmeter for linear measurement of 12-400V DC / AC voltage. The transmitter and receiver display power levels, codes, batteries, detected voltage types and values, and high voltage alarms. Application: The instrument is widely used in communication cable construction, cable construction, construction pipeline construction, communication cable, power circuit and power line maintenance, and is an indispensable tool for maintenance personnel. Detect cables, wires, and water/gas supply pipes buried in wall or floors. Detect breaks and shorts in cables and wires buried in wall or floors. Detect the fuse and distribute the current circuit. Detect floor heating interruptions and short circuits. Detect accidentally covered outlets and power distribution outlets. Specifications: Voltage measurement range: Transmitter: AC / DC 12V-400V Output signal: Transmitter: 125KHz Voltage: Transmitter maximum AC / DC 400V Cable depth measurement: Receiver 0-2.5 m (wall/underground cable) Main voltage measurement: Receiver 0-0.4m Working environment: transmitter and receiver: -10~50°C Storage temperature: transmitter and receiver: -20 ° C ~ 60 ° C Relative humidity (no condensation): transmitter and receiver: maximum. 80% Measuring height: transmitter and receiver: maximum. 2000 meters Transmitter battery: 1*GL6F22A 1604A battery (Not included) Receiver battery: 6*1.5V AAA LR03 battery (Not included) Transmitter size: approx. 24.3 * 7.7 *3.5 cm / 9.6 * 3 * 1.4inch Receiver size: approx.19 * 9 * 4 cm / 7.5 * 3.5 * 1.6 inch Package List: 1*Transmitter 1*Receiver 1*user Manual 2*Alligator Clips (black, red) 2*Test Leads (black, red) 2*Test Probes (black, red) 1*Ground Rod 1*Cloth Bag 1*Cloth Rope Note: You need to read the manual or operation video for operation before use..