Dear Sir/Madam,Communication:WirelessConnectors:3.5mmUse:Portable Media PlayerFunction:Noise CancellingCertification:CE/ROHS/ERP/FCCStyle:fashionable&energetic styleEffective range:200-300MFrequency band(Hz):Customized, 433Mhz/610Mhz/863Mhz/915Mhz etc OptionalUsage:Tour guiding/teaching/translatingKindly email me with details Show More