These 2.4"W x 11"H battery operated candles come with a suction cup to keep them attached to the window, no sill needed. They are brushed nickel colored base and have a 6-hour built in timer. Turn the candle on when you want it to light, and the candle will automatically light for those same 6 hours every day. The candle requires 4 AA batteries which are NOT included. The candle should light for 30 days on 1 set of batteries, and has 2 Dual-intensity LEDs.