1、There is a light emitting device on the top of the balloon. Just pull out the triangle label and then it will be lighted up. Inflate the balloon with a pump and decorates your party easily with fun. 2、Each balloon features an integrated flashing LED light that flashes up to 15 hours (maximum brightness up to 2 hours). Lights are attached to inside of balloon and will not move around. So, lets get it and prepare to decorate your party right now. 3、Tired of the normal party atmosphere? Our LED balloons set will help you! When many of balloons light up in the dark, it seen like a fantasy wonderland with some fog arounding you,and then party atmosphere will be very special and wonderful. 4、These innovative Colorful Light up balloons are great for House Party, Birthday, Proposal, Wedding, Christmas, Anniversary, Dance Club or any other celebtation occasions. Comes in a pack of 20/30/50 mixed colors balloons (5 extra balloons for replacement 5、We have 20/30/50pcs per pack avaliable, to meet your different needs. For a better customer experience, we also add extra 5 balloons for replacement in case that some pieces may be broken during shipment.