Toilet Model BB0904 This unit requires NO ELECTRICTY and NO battery,Flow rate control hot and cold water from low to high,Water temperature control knobs adjusted from cold to hot. Single nozzle can be adjusted direction of spray nozzle,Self clean nozzles, Good for any two pieces toilets,All parts included, easy to install, no special tools requires, Factory warranty for one year of any defect or workmanship Bio Bidet MODEL 0904 are designed for D.I.Y. Installation is simple and Easy 1, 2, 3 requires no special skill or no special tools .