AA batteries power Bastl Instrument's pocket-sized synth
 

Teenage Engineering's Pocket Operators offer tiny battery-powered synths and a range of sounds across a collection of six devices that cost $59 each. Czech synthesizer company Bastl Instruments has a new pocket-sized synth of its own with the Kastle:...

https://www.engadget.com/2016/10/10/...-aa-batteries/