A. This hands-free portable speaker can produce relatively loud and clear sound, so there's generally no need to worry about volume and sound quality. At maximum volume, the sound can travel up to around 800 feet (depending on the surrounding environment). B. When not in use or for storage, it can be folded to save space. You can put it around your wrist to prevent it from falling, and you're unlikely to feel tired even if you hold it for a long time. C. Using 4 C-type dry batteries, it can be used continuously for approximately 6 hours. Since it uses dry batteries, it can usually work normally during power outages or emergencies (batteries need to be provided by the user). D. It can be used for cheering and shouting at sports festivals and club activities. It's also suitable for meetings, speeches, outdoor activities by the sea or river, and camping. As an emergency item, it can transmit your voice over a relatively long distance with a powerful volume. E. Color: Blue F. Material: ABS G. Package Contents: 1 speaker (batteries not included) The package mainly contains the above-mentioned contents and few other products. Notes: Light and different displays may cause slight differences between the color of the item in the picture and the actual product. The allowable measurement error is ±1 - 3 cm.