I recently did a set with Silent Disco Box. They are very useful, small sets with great sound. The batteries last a long time and the range is also excellent. But above all it was great fun, without causing any disturbance! You can still have spoken contact and be close to the dancers. Incidentally I connected 2 PC speakers so that I could hear softly what was being played without headphones, and enjoy the musical atmosphere. The equipment made it possible that the waves of dancing were effortlessly interchanged with sitting and talking. In stead of a big and heavy sound system, just a small box. Delivered on time by GLS. Definitely recommended!