... ,green,yellow,silvery,blueWireless FeaturesBluetooth versionBluetooth V2.1+EDRFrequency range2.402-2.480GHzConnection distance10-20mSupport agreementsHSP,HFP,A2DPMatching the password0000Compatibility multi ... clampMEAS360*310*170mm,30PCS/box,about 7kgProduct Photo: bluetooth receiver hand free