Suitable for any smartphone, MP3 player or laptop. Over 30 hours Playback. Requires 4 AA batteries (not included). No assembly required. Materials include cardboard with metal grill. The audio sibling to the legendary smartphone projector. Lightweight and compact, but with impressive sound quality and volume. Smartphone speaker requires 4 AA batteries which will give up to 30 hours playback. Ideal for picnics, parties or days on the beach. Suitable for plugging into any smartphone, MP3 player or laptop. Available in black to match smartphone projector, or Brown leather effect to compliment smartphone projector 2.0.