Features: Positive and negative electrode detection, DC- level test. Flashlight lighting, to ensure that you work in the dark or low light environment. High standard interface-, can be used for RJ45 RJ11, fast- and slow two gears adjustable, select by your need It comes with a headphone cable to operate in noisy environments, and the volume can be adjusted through a knob. Multifunctional, telephone line find, network line find, power cable line find, network cable proofreading, open short circuit test and so on Specifications: Material: ABS- Receiver: Approx. 198x46x31.5mm/7.80x1.81x1.24in Transmitter: 127x55x30mm/5.00x2.17x1.18in Color: Red/Black Package Includes: 1x Receiver 1x Transmitter 1x Clip 1x Earphone 1x RJ11 Adapter Cable 1x RJ45 Adapter Cable 1x Manual 1x Storage Box note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.