The Sensori self-closing smart toilet seat automatically shuts when the user stands up. And should forgetful gentlemen users accidentally leave it open, it will also close automatically after a few moments! Adjustable hinges fit all standard toilets Hard wearing thermoset plastic Stainless steel top fix hinges Automatic lid closure Batteries not included (requires x3 AAA) SMART TOILET SEAT - With automatic lid closure ADJUSTABLE HINGES - Fit all standard toilets HARD WEARING - Thermoset plastic seat BATTERY - requires 3 x AAA batteries, not included.