You control the pressure until desired effect with the EZ squeeze handle with pressure release valve.

Features:

Material: Silicone (Soft Base ; Hose), Polystyrene (Clear chamber), ABS (Gauge, Pump, Remote ; Bullet)
Size: 11.75(Total length), 2.5to 2.6(Cylinder diameter at base), 7.87 (Insertable length)
2 AA batteries