Feature: 1. [Neckband And Retractable Earbuds] Ergonomic neckband BT headset that fits around your neck and is comfortable to wear. The retractable earbud design allows to be pulled to the desired length and retracted when not in use, and the silicone design effectively reduces crashing sounds. 2. [BT 5.0 And Stereo Sound] Neckband BT headset features advanced BT 5.0 technology for faster and more stable signal connection, CVC noise cancellation technology and built in microphone for high definition stereo sound and subwoofer for clear and stable calls and great music. 3. [Long Battery Life] Wireless neckband headset provides 18 hours of talk time, 16 hours of music time and 300 hours of standby time on a single charge (3.5 hours for full charge). Outdoor use without worrying about running out of power, perfect for training, travel, business, sports, office, etc. Specification: Item Type: Neckband BT Headphone Material: ABS Model: SX 991 BT Version: 5.0 Support BT Protocol: HSP, HFP, A2DP, AVRCP Transmit Power: Class 2 BT Distance: ≤ 10m/32.8ft Charging Time: ≤ 3.5 Hours Talking Time: ≥ 18 Hours Music Listening Time: ≥ 16 Hours Standby Time: ≥ 300 Hours Built in Battery: Lithium Ion Battery Battery Capacity: 300mAh Package List: 1 x Neckband BT Headphone 1 x USB Charging Cable 1 x Pair of Large Ear Plugs 1 x Pair of Small Ear Plugs 1 x Storage Bag 1 x Carabiner 1 x English Manual