What is it?
Deauth detector could detect a Wi-Fi deauthentication attack. Also you can flash any program by yourself.
If you do not know what is wifi deauthentication attack.
You can have a look here: https://github.com/spacehuhn/esp8266_deauther
After you know how it works you can also flash deauth program to this board. This usb kit also could be an attack tool to perform WiFi attack.

What makes it special?
Buzzer -- GPIO5
RGB LED-- GPIO4

Deauth detector V3 replaced high light LED with a buzzer. Now it could show different status by different color and sound.
If you are under WiFi deauth attacked, RGB LED will turn red and buzzer start playing music. If nothing happened then RGB LED turn green.
You can plug it into power bank or any 5V USB port.
It is also an ESP8266 starter kit, you can use it learn esp8266.
You can start from how to control buzzer or RGB LED.
ESP-12E inside, it has 4MB memory.Simple code test:

USB attack firmware: https://github.com/spacehuhn/esp8266_deauther/releases

RGB LED Test:
You have to install Adafuit RGB LED library first.
https://github.com/lspoplove/DSTIKE/blob/master/Deauther_RGB_Test.ino
Here you have to change"define DIN_PIN 15" to "define DIN_PIN 4"

CP2102 Driver Download:
https://github.com/spacehuhn/esp8266_deauther/wiki
Deauth Detect source code: https://github.com/spacehuhn/DeauthDetector

Package Including
1 * ESP8266 Deauther Detector V3 with Case