Features: Wearable neckband stereo sound bluetooth-compatible speaker, built-in microphone, supports high-definition call. Ergonomic design, fit well with the neck and shoulder curves, no compression on neck and shoulder even after long hours wearing. Built-in 4 HiFi speakers (8Ohz 1W, ultra-high sound quality, stereo surround sound, offering you 9D cinema level sound effect. Wireless bluetooth-compatible 5.0 connection, low power consumption, fast transmission speed, no latency, strong anti-interference ability helps to get rid of distance constraint. Features weatproof and waterproof, great for automobile, desktop, fitness, outdoor, home, mobile phones, live broadcast and more. High-performance polymer lithium battery, long-lasting, lasting up to 10 hours working, let the music continue to accompany you. Specifications: Material: Plastic-material Color: Blue, Black(optional) Size: Approx. 18x10cm/7.08x3.93inch Model: BBH-929s Power: rechargeable 3.7V 380mAhx2 lithium battery Output Power: 1Wx 4, stereo surround sound Bluetooth-compatible Version: BLE5.0 Working Endurance: 8-10hours Speaker Unit: 4pcs full-range speaker Noise-reduction: Support CVC8.0 Receive Sensitivity: -105dBm Note: Please allow 0-1cm error due to manual measurement. make sure you do not mind before you order. Please allow slight chromatic aberration due to different display resolutions. Package includes: 1x Wearable Speaker