A great product, compact (6.6cm in diameter and 11cm in length in the storage config: 2 HP magnetized and "folded"), good length cable with small Velcro link, it all fits in a small pouch. The object is of good aesthetic quality (matte black finish "rubberized") but also sound! The power is sufficient (it also depends on the power source) and the quality is decent given the size. I bought it to connect to a Samsung pico projector - SP-H03 - Pico DLP Projector - LED - 30 ANSI lumens - WVGA 800 x 480 to 1000: 1 (another extra product but whose sound power is ridiculous! ) and it works great!
Definitely a good buy. As usual AMAZON services are at the top (fast delivery, perfect packaging), no particular opinion on the seller (marketplace).