Features:- Ear hook in-ear design， suitable for sport .- Lightweight， only 13g， no pressure while doing exercise.- IPX4 waterproof， prevent earphone from rain， sweat.(can't use it while swimming)- 10mm dynamic speaker， good bass， rich medium and clear high sound.- Cancell a wired remote， add a button on earphone body. Make the cable light and convenenient for sport.- CVC noise cancelling technology， make sure that the sound is more clear.- Multi-points， can connect to two device at the same time.Specifications:General Specification  Brand Name	  QCY  Model Number	  QY31  Color	  Black  Wearing Type	  In-ear， ear hook  Net Weight (g)	  13gTechnical Parameters  Microphone	  Yes  Button Control	  Support  Bluetooth Version	  V4.1  Bluetooth Protocol	  HFP/HSP/A2DP/AVRCP  Transmission   Distance	  10m  Battery Type	  Polymer lithium ion battery  Input 	  5V 100mA  Battery Capacity	  85mAh， 3.7V  Charging Time (h)	  2 hours  Music Time (h)	  About 6-7 hours  Standby Time (h)	  160 hoursPackage  Included: 1* QCY QY31 Sport Bluetooth Earphone 3 pairs of Earbuds (L， M， S) 1* Charing Cable 1* User Manual