Welcome to our store! 1、FULL RANGE SPEAKER: Mini Bluetooth speaker elastic biomembrane, sound more penetrating, internal full-range HD speaker, enjoy clear music. 2, CLEAR SOUND: Wireless mini speaker sounds clear, surging dynamic, bass thick and powerful, full of shocking sound. 3, MONO: Wireless Bluetooth speaker with mono speaker combination, clear bass and more shocking. Intelligent chip, one-key switch. 4, BUILT-IN MICROPHONE: Portable Bluetooth speaker with built-in microphone design, supports HD voice calls. 5, USB CHARGING: Waterproof Bluetooth speaker with USB port, compatible with most devices, easy charging, suitable for indoor and outdoor use. Item Type: Mini Bluetooth Speaker Material: ABS Product Size: Approx. 4.5 x 4 cm / 1.8 x 1.6 inches Battery Type: Polymer Battery (comes with built-in battery) Battery Capacity: 400 mah Frequency Response Range: 20HZ to 20KHZ 1 x Mini Wireless Bluetooth Speaker 1 x USB Data Cable 1 x Lanyard 1 x Instruction Manual Customers are our top priority. If you find any problems with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best after-sales service.