Please note, this item ships from an international seller. Expected delivery is 10-15 days. Bluetooth 4.2 Headphones True Stereo In Ear Hanging Neck Sports Headphones Features: In-ear stereo headphones, beautiful sound effects. Bluetooth 4.2chip, fast Bluetooth connection, more stable transmission, simpler connection, and smoother listening to songs. The halter neck design is ergonomic, unrestrained, comfortable and light, suitable for all-day wear. Low-key and simple, easily fit your style. The halter neck design is ergonomic, unrestrained, comfortable and light, suitable for all-day wear. Low-key and simple, easily fit your style. Powerful functions such as switching, answering calls, playing, and pausing Charging for 1 hour, working for 4 hours. Sports, fitness, going out, travel, leisure, work and other places. Product Description: Bluetooth chip and Bluetooth version: 4.2 Bluetooth protocol: A2DP AVRCP HFP HSP Battery: 3.7V 50mAh Charging power: 5V/80mAh Sensitivity: 103db +/- 3dB Impedance: 32Mw Transmission distance: barrier-free 10m Frequency: 2.4GHZ Talk time: about 4 hours Listening time: about 5 hours Standby time: about 160 hours