The Cal Exotics Gyration Sensations Gyrating Hummer is an extreme vibrating and throbbing massager with famous scoop design and love nub. It has 10 powerful functions of vibration, pulsation, and escalation. Has push button control, just hold the button for 4 seconds to turn off. The Hummer features a memory chip that resumes on the last function used. Also has a silky smooth satin finish. Safe and pure for body and pleasure made using phthalate free materials ABS plastic with polyurethane PU Cote massager, ABS plastic with silver plating decor ring, Thermoplastic Elastomers TPE button. 6.25 inches x 1.25 inches. Uses 2 AA batteries, not included.