Hello everyone! I am using this good Knight machines for more than a year. It shows much result which gives an instant reduce of mosquitos. Now the express good night machine has introduced which has advanced mode and normal mode which make the mosquitos to get away. Comparing to spray and coils it will be the best. There is no any toxic level and there will be no side effects. It will be cent percent user friendly. It will give you a best result and it will be User friendly to all the persons. It helps to avoid the deadly diseases too. Thus I am strongly recommending this to everyone whom likes to stay away from mosquitos!