Accessory for The Complete Strap-On SystemPremium, solid, sturdy, unscented Silicone dual probeFlexes and moves with you10 powerful functions of vibration, pulsation, and escalationInstant off button with LED lightState-of-the-art controller with memory chip that resumes last function usedAuto on/off buttonFlanged base for use with most harnessesSuperior suction cup base for versatile use with or without harnessSilicone (probe) ABS (controller) Phthalate-Free PVC (cord)5.5 x 1.5/14 cm x 3.75 cm (shaft)5 x 0.75/12.75 cm x 2 cm (probe)Requires 2 AA Batteries