SHAOYOON F8 Neckband Bluetooth Wireless Headphone Lightweight Earbuds In-Ear Earphones Sports Headsets Magnetic Earbuds (Bluetooth 4.1, Noise Cancelling, Sweatproof)

Color: Black Specifications: Mode: F8 Bluetooth Standard: V4.1 Wireless Profile: Headset, Handsfree Working Frequency; 2.402Ghz-2.480Ghz Audio decoding mode: SBC Regulation mode: GSFK, TT/4 DQPSK, 8DPSK SNR: >75dB Distortion: <1% Operating Range: 10m(33ft) Standby Time: 220hrs Standby current: 5uA Charging Time: 2hrs Talk /Playing Time: 4hrs Charging Voltage: DC 5V Battery Capacity: 60mAh/3.7V Working Voltage: 3.7V(3.3-4.2V) Working Currency: 20mA (Depending on volume) Low battery warning: 3.3V Speaker: 16? +/- 15% Package Contents: 1* F8 Shaoyoon Neckband Bluetooth Headphones 1set * S/M/L EarTips 1* Micro USB Cable 1* User Guide.