Specification: Item Type: Wall Pipe Blockage Detector Material: ABS Purpose: Battery tester Battery Properties: Built-in 18650 lithium battery, 3.7V, 1800mAh Pipeline blocking tester, iron pipe, PVC pipe can be measured Usage Method: 1. Put the signal wire and the transmitting wire end into the pipeline until the signal wire can't forward, then the position of the probe is the blocking position. 2. Turn on the transmitter power switch, the green indicator light is on. 3. Turn on the power switch of the receiver, and hold the signal receiver to detect along the approximate direction of the buried line pipe. If it is close to the inside of the pipeline, the receiver horn of the probe will make a "buzzing" sound, and the loudest part is the blockage point. Make a mark and pull out the signal line, the ground can be dealt with by cutting through the ground. 4. After continuous use for a period of time, the green light of the product starts to flash, indicating that the remaining battery can be used for about half an hour, please pay attention to timely charging.(hands turn the spool to take up and pay off) Weight: 1904 g / 67.2 oz(approx.) Line Length: Approx. 20meter / 65.6ft Size: Approx. 378 x 300mm / 14.9 x 11.8in 380 x 75mm / 15 x 3in Package List: 1 x Wall Pipe Blockage Detector 1 x Handheld Detector 4 x Spare Probe(including 4 spare parts) 1 x USB Charging Cable Note: 1. Please allow 0‑2 cm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 3. Please note that the new type and old type of this product will be sent randomly,and make sure you will not mind before ordering.