Fast shipping: Shipping by Amazon and the“prime” | Safety: No UV, no adverse effects on the human body, No inferior plastic smell, no pungent smell, DC 3V 2AA battery power(not inlcude) | Comfortable: soft light ,it is el light not so strong as led light so the light did not flicker, will not make the eyes produce tension, fatigue.it have adjust elastic tape can use for for Adult and kids | Long lifetime: It can use 8000-12000 Hrs, have 3 modes: Steady Light,Slow flash,Fast flash,Off. this light up mask use two AA battery (not include) | Quality guarantee: 90 days if there are any quality problems within three months after purchasing the product in our store, we can change new to you , and shipped by Amazon and the“prime”