Works great, and can be connected to other speakers.

I've often used this in the car on long road-trips, or at picnics or that kind of thing. It's super light so I just pop it in my pocket or bag and have it with me. It connects directly to a phone to play music, and also just recharges by USB.

Fits in the palm of your hand - I've included a picture for size.

From Amazon:
https://www.amazon.com/gp/product/B004OA714U/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

• Speaker works with any 3.5 mm headphone jack, perfect for laptops, cell phones, portable game devices, MP3 players, etc.
• Vacuum bass design provides surprising volume and bass response in a small space-saving speaker that fi ts in your hand
  Long-lasting rechargeable internal lithium ion battery
• 2 -in-1 cable has USB plug for charging speaker, with audio plug for connecting to audio source-- you can charge speaker while listening
• Twist speaker to expand, use two for simulated stereo or a single speaker for mono
• Connect multiple speakers via the line-out jack