Features: The sensitivit y of the receiver can be adjusted either manually or automatically. The transmitter has the function of self-inspection and both transmitter and receiver have mute function. Compact structure, strong and durable, convenient to carry. Transmitter built in DC/AC voltage meter for linear measurement of 12-400V DC/AC voltage. The transmitter and r eceiver display power level, code, battery, detected voltage type and value, and high-voltage alert. Application: This instrument which is widely used in communication cable construction, electrical cable construction, building pipeline construction, telecommunications cables, power supply circuits and electric line maintenance is an indispensable tool for maintenance personnel. Detecting cables, electrical lines, water/gas supply pipelines buried in wall or earth. Detecting interruptions and short circuit in cables and electrical lines buried in wall or earth. Detecting fuses and assigning current circuits. Detecting interruptions and short-circuits in floor heating; Detecting sockets and distribution sockets having accidentally been covered. Specification: Voltage Measurement Range: Transmitter: AC/DC 12V-400V Output Signal: Transmitter: 125KHz Voltage: Transmitter Max. AC/DC 400V Cable Depth Measurement: Receiver 0-2.5m (wall / underground cable) Main Voltage Measurement: Receiver 0-0.4m Work Environment: Transmitter & Receiver: 0~40℃ Storage Temperature: Transmitter & Receiver: -20℃ ~ 60℃ Relative Humidity (no condensation): Transmitter & Receiver: Max. 80% Measuring Height: Transmitter & Receiver: Max. 2000m Transmitter Battery: 1pcs x GL6F22A 1604A Battery (NOT included) Receiver Battery: 6pcs x 1.5V AAA LR03 Battery (NOT included) Test Lead Length: Approx. 1.2m/3.9ft Test Pen Length: Approx. 12.3cm/4.8inch Ground Rod Size: Approx. 22.7 x 11cm/8.9 x 4.3inch Transmitter Size: Approx. 19 x 8.9 x 4cm/7.5 x 3.5 x 1.6inch Receiver Size: Approx. 24 x 7.8 x 3.5cm/9.4 x 3.1 x 1.4inch Weight: Approx. 1373g / 48.4oz Package List: 1 x Transmitter 1 x Receiver 2 x Crocodile Clamps (Black, Red) 2 x Test Leads (Black, Red) 2 x Test Probes (Black, Red) 1 x Ground Rod 1 x User Manual 1 x Black Bag 1 x Strip .