Multifunction: Open circuit or short circuit test, telephone line search, cable tracing, DC level test (3-10V DC), network line search, network cable rendering, etc. Low voltage prompt function: When the transmitter's function selector is in search mode, if the battery voltage is lower than 6V, the transmitter's \"SCAN\" and \"Line Sequence\" LEDs will flash simultaneously to remind the user to replace the battery. Headphone function: In a noisy environment, headphones can be used to avoid external interference. Headlight function: You can easily work as usual while turning on the switch at night and in the dark. Adjustable volume function: Turn the receiver's volume adjustment knob (the higher the volume, the higher the sensitivity) until the sound is appropriate. Power saving: Automatic delay shutdown. Approximately 1 hour after shutdown, the device automatically enters shutdown mode. Specifications: Product name: Network line finder Product model: M469A Battery usage: 6F22 9V Battery (not included) Interface end: RJ11, RJ45 Transmitter size: 127 x 56.5 x 30 mm / 5 x 2.22 x 1.18 inches Transmitter weight: 62 g / 2.19 oz Receiver size: 198 x 46 x 31.5 mm / 7.79 x 1.81 x 1.24 inches Receiver weight: 77 g / 2.72 oz Material: ABS Color: Black Package contents: 2 x Tester 1 x RJ11 Test cable 1 x RJ45 Test cable 1 x Storage bag 1 x Headset Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the actual item. 1-3 cm error is allowed.