The Zikko Dr. Rock mini 2S massage gun is smartphone-sized, comes with 4 heads, packs an 8mm punch, and is ultra-quiet at 45db. Powered by a lithium battery, capable of 15mins/day over 30days, you should always be good to go- but if you ever get stuck, its cleverly topped-up via a Type-C port, no mains necessary! Just take a back up powerbank with you & it's one of the only massage guns which is truly portable for all occasions.
Power and Speeds
8kg and 3 gears @1800/2400/3200rpm
14cm - same as a smart phone. Easy to pack in your pocket or small bag.