Compatible with AIRROBO T10+ Robot Vacuum Cleaner. Water Tank x 1 When using the water mop function, please be careful to refill the water and wash the mop. To refill the water, it is sufficient to fill the water tank up to 80%. If you fill it up completely, there is a risk of "no water coming out" or the water sensor not activating properly. The 2-in-1 electronic control water tank supports 3 levels of water control and intelligent mopping, making it ideal for cleaning hard surface floors such as wood and tile.