ONiLAB Digital 3D Shaker, 10–70RPM, 9° Angle, 5kg Capacity

I gave it 3 stars because it does what it's supposed to do. Yet there's 3 issues that are really annoying. 1 - anytime you press any button, it emits a loud beep. I mean, annoyingly and unnecessarily loud. Maybe it's OK if it's only being used in a hospital or medical environment. There's no way to turn it off or turn down the volume on it. This is extremely annoying since I use this inside the house. The wife and my dogs hate it as well as I do. 2 - the instant you turn it on, the moving tray does a very fast and sudden jerk movement. Which means, to avoid getting hit by it on your arm while you're reaching for the power switch, you need to come at the power switch from the side or over the top of the unit. That's the only way to turn it on without the tray slamming into you when you power it on. 3 - while it's running, it makes an annoying motor hum that changes pitch up and down as the tray is doing it's tilting. Kind of sounds like a muffled cat being swung around and around. But I will say that it does its job.