The company also makes a portable barbecue light that has an electronic mosquito repellent built in.

Electronic mosquito repellent devices which make very high frequency sounds that are supposed to keep female mosquitoes away, do not have supporting evidence.

Electronic mosquito repellents or a $30 coffee sling - a strap that suspends hot beverages from interior tent poles - seem only partly useful.

It goes on: "Given these findings from 10 carefully conducted studies, it would not be worthwhile to conduct further research on EMRs [electronic mosquito repellents] in preventing mosquitoes biting or in trying to prevent the acquisition of malaria".