LED works by water flow,No battery is needed. Type: Thermostatic Shower Set Wall Mount Shower Arm:14.5″(37cm) Top Spray Size:12″(30cm”); Thermostatic Mixer:Solid Brass;2-Water Model Connection:G1/2 Standard;Finish:Chrome Not Yet Rated : 0 Customers PriceClick to Check PriceShippingweight9.9 poundsColorChromeFinishChromeSpecialfeaturesEasy to InstallManufacturerRozinsanitaryStatusin stock.Soldbysuperwater .