This effortless whitening kit is a complete system that includes everything you need for an at-home teeth whitening session. You'll get: 9 syringes of 22% Carbamide Peroxide whitening gel syringes and one desensitization gel+ 2 double-sided mouth trays +5 built-in blue LED light bulbs+ teeth shade guide+ user manual+VIP card. The battery lasts 36 hours and can be used about 144 times.