XUNDD Open-Ear Earphones

Play/Talk Time: Approximately 4 hours at 70% volume. Transmission Distance: Around 10 meters. Frequency Response: 20-20kHz. Bluetooth Version: 5.4. Charging Box Battery Capacity: 300mAh. Supported Protocols: A2DP, HFP, HSP, AVRCP. Standby Time: Around 50 hours (for headphones). Executive Standard: Q/XUNDD 8-2023. Impedance: 32Ω. Charging Voltage: DC 5V. Headphone Battery Capacity (Left/Right): 30mAh. Charging Time: Charging Case: 90 minutes. Earphones: 45 minutes. Package Includes: 1 Pair of Earphones. 1 Charging Case. User Manual (English and Chinese).