For the Most Professional Radio earpieces on the market, with only 2 connectors you need to be concerned about. The 2-pin connector, with a good majority of kenwood radios using this connector, with the most popular TK3301 & TK3000. The second connector is the multi-pin connector, it screws onto the radios and is used by some of the newer Kenwood radios. Examples of the radios used are the TK2140 & TK3140.

These earpieces are used by the best in the world and these are some of the best earpieces on the market.