Dealing with summer heat is extra awful when trying to get a good night's sleep. Rather than suffering through the warmer months, use a few appliances to keep your bedroom at a cool, comfortable temperature. This includes utilizing a dehumidifier, which will not alternate room temperature but will remove humidity.
A dongle is a small piece of hardware that connects to another device to provide it with additional functionality.
A dongle is a piece of attachable hardware, which provides some functionality. It is a general term, not about security devices only. It can be a mass storage device, USB modem, Bluetooth, etc., etc., etc.