digital signal transmission No interference, no noise Makes a clear and loud reminder sound Find the target line quickly Efficient live line hunting Support 60V POE line search Network line sequence proofreading 9 alignment test lights make alignment easy (G light is a shielded wire test light) Hunting function:Available line types: RJ45, RJ11 Alignment function:Detect cable open circuit, short circuit, line sequence Check status within the switch hunt signal:digital signal Transmitting signal distance: 300 meters working temperature:0~40℃, maximum 80% relative humidity (non-condensing) storage temperature:-10~50℃ maximum 80% relative humidity (The product appearance and printed words depending on the batch, but this does not affect use) Color: As Shown Material: ABS Package Contents: 1 * transmitter 1 * receiver 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.