Specially designed ear clips typically used with Lexicor style Electro-cap with ear leads. 3 1/2 inch DIN Style EEG ear clips. For Lexicor style Electro-caps with ear leads. Standard 1.5mm DIN socket. This short ear lead plugs into the DIN socket on the cap.
This design allows you to connect the E5-9SDROPS ear clips right into the Electro-cap. The old style clips can be found here.