The device worked perfectly on the first day. Allowed me to quickly trace some CAT5 cables around my new home. The next morning I tried again but the sending device kept disconnecting after 10-15 seconds. I thought I left the power on so I replaced the batteries. There are no dice. Tried different test modes etc. There is no cube. After it turns off, pressing the "Test" button or changing the switch mode will not restart it. You have to press the PWR button for it to work. and then turns off after 10-15 seconds. The seller is very responsive and sent a replacement which has just arrived. If that isn't crap then I would give it 4 or 5 stars. Easy to use and great value for money. if it works. By the way, the English lessons are terrible, almost funny to read.
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