Features: Designed for the ears, with three sizes of silicone accessories, fit the ear concha, comfortable and balanced to wear, sealed and soundproof. Ergonomic design, effectively blocks 24DB noise, suitable for daily use. Enjoy music quietly without being disturbed by touch, etc., and improve sleep quality. High-quality sound quality, stable Bluetooth 5.3 connection, compatible with a variety of devices. Play for 4-6 hours on a single charge, and can be used for 30 hours with the charging box. Supports wireless charging, suitable for a variety of scenarios. Specifications: Transmission range: 25 meters. Usage: In-ear. Bluetooth protocol: 5.3. Whether single or double ear: bilateral stereo. Waterproof performance: IPX4. Material: PC+ABS. Battery life: 4 - 8 hours. Packaging information: 1 * Bella Sleep Pro earplugs, 1 * USB data cable, 1 * User manual.