This E-28 earhook is a LOK Style Earpiece which is used with Two and Single Wire Surveillance Earpiece's. The E-28 features Female Snap Lok, C shape earhook with Ear Bud, Can be worn on either ear and easily snaps into the main single or two wire kit. The E-28 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.