... CE Automatic Aerosol Perfume Dispenser with 7.5/10/15/30 Minutes Spray and 300/320ml Capacity KP1158A 1.Power switch display ... when there is no lightNIGHTspray every 7.5/10/15/30 minutes without light, stay idle when there is lightINTERVALperfume spray interval ... selection(7.5,10,15, 30 minutes)7.5M when switch on,spray every 7.5 minutes10M ...