The My First Vibrator is a great gag gift for the bachelorette. You can give it to her to hint at the way her sex life will dwindle after marriage. You could present her with it if it's known that she has quite a few vibrators already. There are lots of scenarios in which the gift of a vibrator would be pretty hilarious.
The cold, hard facts:
The My First Vibrator features a slim, hard-shell design and is just under seven inches in length. My First Vibrator has a variable speed control knob. Also included is a stretchable french tickler that can be placed around the vibrator for added clitoral sensation.
The My First Vibrator uses 2 AA batteries. It is about 1.25" in diameter and 7" in length.