Key points: 1.Universal Compatibility: Compatible with most top flush toilets (flush valve button diameter up to 3 inches), this automatic toilet flusher can be installed in minutes without any tools or plumbers. It is suitable for most toilets except side-flush, sectional, wall-mounted and smart toilets. 2. Fast and flexible: The automatic toilet flusher has a sensitivity time of 0.25 seconds, which means it can detect your presence and flush the toilet quickly and efficiently. It is not limited by space and can be installed wherever needed, suitable for any bathroom. 3. Contactless comfort: Our wireless sensor can detect hand movements from 50 cm away and automatically start flushing. The device has a sensing range of 20 cm, ensuring complete and hygienic operation. 4. Long-lasting battery: The automatic toilet flusher is equipped with a 1800mAh lithium battery that can be charged via USB. With up to 3 months of continuous use on a single charge, it's durable and convenient. 5. Easy installation: No need to replace the entire mechanism, just install the automatic flushing device on the existing button. Comes with everything you need for a quick and safe installation. Specification: Name: Toilet smart sensor flusher color: White Size: 14*6.4*6cm/5.51*2.52*2.36 inches Weight: 230 g battery model, 271 g rechargeable model Material: ABS Charging method: 5VType-C (charging model) Battery power supply: 3 AAA batteries (need to bring your own) Sensing time: 0.25 seconds Top sensing distance: 0-20cm Wireless transmitter sensing distance: 0-50cm Pressing weight: less than 5kg Battery capacity: 1800mAh (rechargeable model) Wireless transmitter power supply method: 2 AAA batteries (need to bring your own) Fixing method: tape List: (battery type) toilet smart sensor flusher*1 Or (rechargeable) toilet smart sensor flusher*1, charging cable*1 Or (rechargeable) toilet smart sensor flusher*1, wireless transmitter*1, charging cable*1