The Plus Battery is a 510 battery that offers three precision heat settings with one button: - Blue (Low) - Green (Medium) - White (High) It also offers Sesh Mode, a heat cycle that runs for twelve seconds without having to hold the button down. Button functions: - Hold for continuous heat. - 2 clicks: Initiates Sesh Mode. - 4 clicks: Cycle through heat settings. - 5 clicks: Turns the Plus on and off. Also compatible with 510-threaded carts.