Low voltage, low power consumption power amplifier IC with quality performance and low distortion. Built-in 180mAh battery eliminates the need for an external power supply, providing up to one and a half hours of playtime at maximum volume or approximately 2 hours at 50% volume. o cable included at the bottom of the speaker. Comes with a USB charging cable. Features a unique retractable speaker design. Compact and lightweight with a hanging hole for easy portability. Compatible with MP3, MP4, MP5, cell phones, computers, and other devices with a 3.5 mm o jack. Color: Black. Material: Silicone + metal. Size: 5.2 x 3.8 cm. Package includes: 1 x Loud Speaker, 1 x USB Cable. Product contents limited to items listed; other accessories not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement tolerance: +/- 1-3 cm.