A deauther allows you to disconnect devices from a WiFi network. Even if you're not connected to that network. Deauthers take advantage of a weakness in the 802.11 protocol which allows the sending of deauthentication frames by unauthorised devices.

Deauthers come with other features such as Beacon Spamming (spamming WiFi network names) and Probe Spamming

Our deauthers are not WiFi Jammers, though they have a similar effect