Upgraded with the flavor-changing technology, Solobar Defender 40000 Flavor-Changing Vape offers at most 40000 puffs and 3 flavor options in one vape. It uses two separate tanks for e-juice of two different flavors. You can enjoy one single flavor or a mixed flavor for both of them. Solobar Defender also has two vaping modes (Regular/Boost Mode) for advanced vaping needs. If you want to know how much e-juice is left or when to recharge it, just check the big side screen that dazzles with colorful lights. Try Solobar Defender 40K and you will like the magic of combined flavors.