Made with a heat-reactive thermochromic coating that changes colour in your hand. Power the pen on and off with 5 quick puffs and change the voltage settings with just 3 quick puffs. You've never experienced a vape pen like the Pulsar 510 DL Vaporizer. The outer casing is made with a heat-reactive thermochromic coating that changes colour in your hand, and each device is designed to grant the user full control through the power of breath. Power the pen on and off with 5 quick puffs and change the voltage settings with just 3 quick puffs. The DL also has a pre-heat mode which can be activated with 2 short puffs to prepare your carts for the next rip. With the DL, you can blend in when you want to and stand out when you don't.