Product Description Material: aluminum alloy + ABS material Size: 8.5 * 8.5 * 3.7cm Color: black Battery specification: built-in 400MAH lithium battery Speaker specifications: 40mm, 3W. Package Contents: 1 * Aluminum alloy card bluetooth speaker 1. STEREO SOUND - 40 mm high-quality horn speakers and a professional audio chip produce stereo sound with improved bass, rich mid-range and clear, high-pitched sound without distortion at any volume. 2. BLUETOOTH 5.0 STABLE CONNECTION AND MULTIPLE MODES - Thanks to the advanced antenna and Bluetooth 5.0 technology, our Bluetooth speakers offer a greater wireless range (up to 10 m away from your device), better wireless quality and a more stable connection, high compatibility. Besides, it supports TF card. 3. TRUE WIRELESS STEREO PAIRING - With TWS technology, you can connect 2 TWS Bluetooth speakers to your phone at the same time and thus achieve 360-degree dual-enhanced stereo sound. 4. Small and Portable - It adopts a small diameter, large magnetic circuit design, a charged bass diaphragm on the bottom, the bass performance is visible, the sound is loud, portable and compact, and the output is stable, which makes a shocking ear impact. 5. Metal Bowl - It is formed by high density stamping, finely polished and frosted. Make every craft with your heart and bring you an exceptional sense of craftsmanship.