Size: adjustableProduct includes.Host + cord + set of 4 clipsSet of 4 clipsPower supply. 2*AAA batteries (not included).Packaged discreetly for privacyFeatures.1. Insert the AAA batteries into the controller. Note the positive and negative values.2. Attach the nipple clamps to the controller.3. Adjust the 2-piece nipple clamps so that they close the skin after a period of time. Otherwise it may not work.4. Press the "Power" button for 2-3 seconds to turn the machine on 5.5. Press "Puise / Numb / Absorb / Auto" to select the electric shock mode. The gear on the right controls the power, up is weak and down is strong, you can adjust the power until it suits you.