Good Vibrationz Mini Portable Pure Energy Acoustic Resonator Speaker System - Compact, Light-Weight and Portable Vibration Speaker

I haven't used the products yet- -I purchased them for Christmas gifts. But the are simple, light, affordable, and will be something unusual and fun to try!

Use these with rife frequencies on shin bones or shoulder blades. Very good results!

Not very loud. It's an interesting novelty to play around with but not good if you are seriously looking to enjoy music.

I picked up one of these in a thrift shop for $5, unopened, on whim. At first I was not impressed. It's very quiet and takes some playing around with to figure it out. The package had a picture of this on the side of a coffee mug so I tried mugs and cups of various materials but none impressed. By chance, I had a 48 oz box of Kosher salt, nearly full still, on my kitchen table so I set this speaker on the side and BOOM it was 10x louder than before.I now understand that this speaker works by transmitting the sound waves directly to whatever it's attached to so that item/ material now becomes, or essentially is, the actual speaker. By itself, it's very quiet and of course it is when you consider that it's not meant to be the actual speaker but to turn whatever it's attached to into the speaker instead. It's a neat concept not unlike someone I saw on Youtube who made large, great sounding speakers out of cardboard and small piezoelectric transducers like you can buy here on Amazon for $7 a dozen. The transducers can either be sensors that turn physical sensation/ motion/ etc. into electrical signals, or, if run backwards like hooked up a sound source, they can turn that signal into motion or vibrations. Attached to another object, they then transmit energy waves throughout that material which amplifies the sound.The concept is the same here for this little device. I'm not sure if this is a simple piezo inside or not unless I open it up which might break it. I suspect, given the strong vibration power it puts out (when used correctly) it may be a small magnetic speaker. It's fairly impressive for a little inexpensive device powered by 2 AAA batteries.This thing shines when it's attached to cardboard of all things. I stuck it to the back of a large, flat Amazon box I had in the garage and wow, was I impressed. The sound created with this little guy and a cardboard box was surprisingly loud with very good range both bass and treble. I can't believe what amazing sound was coming out of that cheap cardboard box. I want to try larger flat pieces of cardboard next and I'd be very interested to see how a sheet of 1/8 or 1/4 inch plywood would sound. The properties of these materials must be very good at propagating what this little speaker is transmitting.Anyway, you're not going to win any hi-fi contests with this of course. It is a fun, inexpensive toy to play around with and maybe use as a teaching tool. I'm definitely going to let my kids play around with it so they can learn about the relationship between electrical signals and the sound we hear. It's a pretty cool little item and would probably make a nice stocking stuffer for someone who's into science stuff.