The Micro Wanachi keychain is the world's smallest massager that is big on thrills! At just 2.5 inches tall, this tiny tickler is perfect for on the go fun, anywhere and any time! Just flip the ON/OFF switch and you are ready for a good buzz. Keep it on your keys and you will always be ready for action! Batteries included. Caution: this vibrator is not intended for therapeutic purposes and is recommended for external use only. Prolonged and frequent use is not advised or recommended as these items are sold for novelty purposes only. This vibrator should be used with discretion. Vibrating mini massager requires AG13 batteries included. Phthalate free materials used ABS plastic.