Please note that this is not a real Theremin, it's a "toy-theremin". It's very good for the price, and it sounds amazing through a guitar amp. The cons: you can't control the pitch as you would with a real theremin where you have two axes to control pitch and volume. It's however very nice to experiment with and add accents to tunes, but don't expect to get the exact same sound twice as it's quite hard to control. Also if you set it near any other electronic device (any other amps, a PA, mobile phone, etc), it will interfere with its sound. However, as I was saying, for the price it's a fun instrument to play with. The shell is also quite sturdy and it comes with a soft plastic case. You'll need a tiny screwdriver to set it up. The power supply is a battery, so it's fully portable.
This isn't really comparable too the more expensive "real" Theremins as it's almost impossible to play melodies on it. However, as an effect it is great and very atmospheric, preferrably combined with a delay and/or other effects. The build quality feels a little cheap and the light weight combined with the placement of the antenna makes it very unstable. It really need to be secured with tape, velcro or similar. For the price it is very nice though. Not a necessity but great fun!
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