Hong Tai-fu Technology (Shenzhen) Limited(Formerly known as Shenzhen Radio Technology Co. Ltd). Since 1998, we have been producing a wide range of accessories for walkie-talkies which focus on producing Bluetooth Devices,Earpieces,Acoustic Tube,Remote Speaker Mic and so on,which used in the military, firefighting, building construction and other high noise place. We build accessories from your specifications to suit your individual needs,Call us today.