repellent

This is probably of interest to those who lives in areas with mosqitoes. There is this electronic mosqitoes repellent. Makers usually claim that it is based on some neat theory/logic. 1. Only female mosqitoes bites. (True) 2. Female mosqitoes shy away from male mosqitoes. (True or False ?) 3...

I ate outdoors at a Mexican restaurant last night and saw a dozen plastic bags filled with water hanging under the eaves of an awning. When I asked about their purpose, I was told that they keep mosquitos away. Has anyone ever heard of this technique?