Tanda ZAP is clinically proven to clear or fade blemishes within 24 hours. The triple threat for clearing pimples fast: It uses powerful blue light to destroy acne-causing bacteria, along with sonic vibration and gentle warming to help open pores so bacteria have nowhere to hide. Light : 414nm blue LED light kills the acne-causing bacteria. Heat : A warming effect opens up pores so that the light can reach more bacteria. Sonic Vibratio1n : Increases microcirculation to help reduce swelling, inflammation and redness. Batteries included.