This E-42 COILED CLEAR TUBE EARPIECE is a LOK Style Earpiece which is used with Two and Single Wire Surveillance Earpiece's. The EM-42 features Female Snap Lok, Acoustical Coiled Clear Tube, Can be worn on either ear and easily snaps into the main single or two wire kit. The EM-42 is only the earpiece and requires the additional of the following wire kits- M-27AC/LOK 2 Pin w/Screws wire kit or M-27C/LOK 2 Pin w/Screws wire kit.