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. Audio cable included at the bottom of the speaker. Equipped 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 audio jack. Color: black. Material: silicone and metal. Size: 5.2 x 3.8 cm. Package includes: 1 x portable travel loud speaker, 1 x USB cable. Additional products not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowed within +/- 1-3 cm.