I have already received two units. Both had problems. I will not order a third one. The first turned on, but in order to disconnect and turn off the device, it was necessary to open the battery cover. Also, the vertical laser line had a sideline that appeared on the wall at a slight angle to the first. I do not know why. The second block did not turn on at all. Eventually, after checking the batteries and holding the switch down for a few seconds, the LED would illuminate, indicating that pulse mode was active. The problem with everything I've tried is that the lasers never turn on. The last thing I noticed was that both devices were shipped with the laser head unlocked. I've been a contractor for over 35 years and I always block my lasers before storage. At first glance it looks like a well-made device, but if the workmanship or electronics are poor then it's a waste of money.
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