Noted・ How to use it first time:When you first time to use the earphone、 The bluetooth do not opened to "Pair mode"、 so it can't connect any Device.Please press the power button 5-10s when earphone was closed、 Red and blue LEDs will flicker alternately、 and then use your device connect the bluetooth.Also、 please find the manual to check how to connect it.Sport exercise headphone、 with HD music play、 enjoying music and other audio when doing exercise! Highly compatible Bluetooth 4.0、 you can connect the headphone easily with your phone. It also has built-in microphone、 which can answer the call conveniently without holding your phone. Special magnet attached design prevents tangles when 2 plugs stick together. Light weight makes you easy to wear it even a long time.Features: - Support multi-point connection、 connect with two different devices at the same time.- Can call or answer the phone.- Support voice report number automatically.- Support voice reminding function.- With power consumption display function for iPhone.- With vioce controlling function.- Support song switching. - CVC 6.0 smart noise reduction.Specifications:Profile support: HSP / HFP / A2DP / AVRCPCable length: 600mmBrand: awei Model : A920BL Wearing type : In-Ear Function : Song switching、 Multi connection function、 Bluetooth、 Voice control、 Answering phone Connectivity : Wireless Application : Sport Driver unit: 11.5mm Sound channel: Two-channel (stereo) Frequency response : 20-20000Hz Impedance : 16ohms＼15 percent Sensitivity : 110dB + / - 3dB Output power: 10mw Talk Time: 6h Music Time: 4h Standby time: 200h Charging time: 1h Bluetooth: Yes Bluetooth version: V4.0 Bluetooth distance: W/O obstacles 10m Package weight: 0.102 kg Product size (L x W x H) : 65 x 2.4 x 1.2 cm / 25.55 x 0.94 x 0.47 inches Package size (L x W x H) : 18 x 9.7 x 3.1 cm / 7.07 x 3.81 x 1.22 inches Package contents: 1 x A920BL Bluetooth Earphone1 x USB Charging Cable1 x Bilingual User Manual in English and Chinese 2 x Pair of Earbuds1 x Cable Clamp1 x Pair of Ears Caps