The Apollo Alpha Stroker 2 is a totally self-contained USB vibrating power stroker with pressure sensitive squeeze pads to customize tightness. 30 functions of intense vibration, pulsation and escalation, memory chip resumes last function used. Removable and replaceable sleeve for easy cleaning or independent use. Textured chamber for added sensations. Easy push button control. Removable cap for safe and clean storage.100% waterproof. USB rechargeable (charging cord included). LED light. Materials: TPR (sleeve) ABS with PU Cote (case) Silicone (d??cor, buttons). Dimensions: 10" x 5"/25.5 cm x 12.75 cm (stroker), 7.5" x 4"/19 cm x 10.25 cm (sleeve).