(4) EAR CLIP/CLAMP ELECTRODES (Like the Picture Shows)with 2mm Female Connector that connects to Pin Electrode Lead Cable from Digital Massager, TENS 3000 and 7000 and others that use 2mm pin lead connectors from lead cable Function and Product Description: Research has shown earclip electrotherapy has been used to control anxiety, depression, and/or insomnia without drugs. www.alpha-stim.com/the-alpha-stim-scs/An Ear Clip Electrode is the logical choice to turn to when performing electromyography diagnostics and stress testing, which are two situations where electrical stimulation is necessary on the ear. Ear Clip Electrodes are great for microcurrent stimulation therapy. They are compatible with numerous EMS & TENS units on the market. Between treatments, it is recommended that the Ear Clip Electrode be kept clean and dry. Electrode clips/leads-connect to a electrode lead cable that has 2 mm female pin connecters Length of Lead is 37.2 Inches Long 1 Plastic Earclip Clip on each lead line. Electrode Contact is .9cm long x .3 cm wide Earclip Measurement is 4cm long x 1.5cm wide These earclips are also compatible with TENS 3000, TENS 7000 and Intensity 10 as well as Digital Massagers with leads that have 2mm pin connector Thank you and have a wonderful day!