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It’s more glossy than matte.
It is 110. Only appliances such as electric ranges and clothes dryers require 220v circuits. Small “counter top” appliances do not(however, you have to be care how many of them you have plugged into one particular circuit. If you overload it, you will pop a circuit breaker or blow a fuse if you live in an older home with a fuse panel). I have no idea about what Hz level it is.
There may be a factory-approved way but if not then as I stated in my own review find where the sound comes out and liberally apply the point of an ice pick.
The wattage range of this model is 1100-1300.