The Seahorse Pro has a built-in 650mAh rechargeable battery which should last a couple solid vaping sessions. Variable voltage functionality has also been incorporated and the user can cycle between 3 preset voltage settings which range from 3.2V, 3.6V, and 4.1V. Overall, the Seahorse Pro is one of the most versatile and effective devices we have ever seen and it will not break the bank in the process.