LED Shirt by Rave Raptor Sound Activated Shirt Beat to The Music Light Up T-Shirt Sound activated LED Panel Black high quality cotton t-shirt Each shirt comes with an adjusted volume sensor to adjusted for the speed of the flashing. Volume Sensor accepts two AAA battery (not included) Hand Wash Only. Batteries not included [EXCLUSIVE WARRANTY] HIkari Company offers an exclusive manufacture warranty of 3 months. This warranty is exclusive to sales through Hikari Company and only our authorized re-sellers. Purchases made through unauthorized re-sellers would not fall under the manufacturer's warranty. Please do not purchase from various third party seller as it will NOT be included in our manufacturer's warranty, and may be a knock off and therefore be unsatisfactory quality.