http://www.zlinck.com/bluetooth-earphone/
Product Description
Product NameTrue Wireless Earbuds
Model No.TWS Headphones
MaterialABS
ColourBlack
ModelTWS Earphones with charging box support wireless charging
TypeTrue Wireless (TWS) Stereo Headphone with wireless charging function
wireless charger VersionBT V5.0(CSR)+EDR,Class 2
Operation RangeUp to 10 meters
SupportsHSP/HFP/A2DP/AVRCP protocol
Frequency Response Range21Hz-18KHZ
Up to 10 metersBuilt-in high-sensitivity microphone (-38d