Pocket-Sized Keychain Speaker Robot w/ Rechargeable Battery - Includes Cleaning Kit Pocket size speaker goes anywhere! Attach it to your keys, clothes, bags, purses, and more! Universal design works with tablets, phones, MP3 players, laptops, handheld gaming consoles, and other devices using a 3.5mm audio connection. Unique styling brings fun to your audio and lets you share music with friends and family in a cool and creative way Built-in lithium-ion rechargeable battery lasts up to 4 hours on a single charge! Use the included USB to 3.5 mm charging cable to charge him back up in no time. Speaker also automatically powers down when not in use. TECH SPECS - - Frequency Response: 50-20kHz / Power Output: 2W / Play Time: 4 hours / Weight: 0.1 lb / Dimensions: 2.8 x 1.8 x 1.8 inches