Product Material: Aluminum alloy + ABS material Size: 8.5*8.5*3.7cm Color: black, red, gold, silver gray Battery specification: built-in lithium battery 400MAH Speaker specifications: 40mm, 3W Package content: 1*Aluminum alloy card Bluetooth speaker 1.STEREO SOUND - 40mm High-quality Horn speakers and professional audio chip produce stereo sound with enhanced bass, rich midrange and clear high-pitched sound without distortion at any volume. 2. BLUETOOTH 5.0 STABLE CONNECTION & MULTIPLE MODES - Adoption of advanced antenna and Bluetooth 5.0 technology, our Bluetooth Speakers can provide you with a larger wireless range (up to 10m away from your device), better wireless audio quality, more stable connection, high levels of compatibility. Besides, it supports TF card . 3.TRUE WIRELESS STEREO PAIRING - TWS technology allows you connect 2 TWS Bluetooth Speakers simultaneously with your phone, realizing 360-degree true dual enhanced stereo sound. 4.Small and portable- It adopts small-diameter and large magnetic circuit design, supercharged bass diaphragm to the ground, the bass performance is visible, the sound is loud, portable and compact, and the output is stable, bringing shocking auditory effects. 5.Metal shell- It is formed by high-density stamping, finely polished and frosted. Do every craft with your heart, and bring you an extraordinary sense of craftsmanship.