A "grinder" is a toy that offers stimulation when you sit on it or rub it against the genitals or butt.  The Inya Grinder Pad offers stimulation in a couple of different ways.  First, it is a vibrating pad with 9 different settings. You can place it on a chair (or any flat surface) to sit on and grind against, or it is small enough that you could hold it in your hand to press against yourself or a partner.

Second, there is a stretchy hole molded into the pad, so you could add a dildo if you wanted to add penetration to your grinding play.  The hole can also act as a way to hold the Grinder Pad if you are using it as a hand-held toy.

The outer layer of silicone covering the pad is smooth and pleasant to the touch, with mild ridges to add a little more friction (but not too much).  Use with plenty of water-based lube.

Finally, this toy can be controlled manually via the button on the underside, or it can be controlled via a free app.

Rechargeable: 90 min charge/60 min use.

Warranty: 1 year

5.875" long x 4.125" wide x 0.98" thickness.  The opening for an optional dildo (sold separately) is 1.375" diameter (unstretched). It can stretch to accommodate larger toys of up to about 1.75" diameter.