I opened it once and put sand in it. Due to a wiring issue with the outlet, I couldn't use it at home, so I'm selling it at a low price to a cute hamster! Hamster sand bath heater, compact and easy-to-use design. - Product Name: Sand Bath Heater - Size: 126 x 136 x 73mm - Power Supply: AC100V - Power Consumption: Approximately 14W - Target Animals: Hamsters Thank you for looking.