With the Reverb nipple suckers you will have double the enjoyment. The black suckers give you a lovely pulling, sucking sensation on your nipples. The bullet vibrators also give you a deep vibrating stimulation on your nipples and breasts. Place the suckers on your nipples. squeeze the small ball and feel how the suckers suck your nipples inside. Then turn on the vibrators and experience the power of the Reverb. This set of nipple suckers comes with the batteries needed for the bullet vibrators. This will make sure that you can get going right away!