Uwell have created the Whirl 20 Vape Starter Kit which is a constant wattage device that pushes out 25W of power from it's internal 700mAh built in battery. This kit comes with a 2ml tank which is suitable for DTL and MTL vaping styles and uses the whirl 0.6ohm replacement coils. 

UWELL WHIRL 20 Vape Kit Features:

• Dimensions - 20.2mm Base Diameter, 110.8mm Height
• 2mL Maximum Juice Capacity
• Integrated 700mAh Rechargeable Battery
• Superior Stainless Steel Construction
• Integrated Unibody Design
• Quartz Glass Reinforcement
• Maximum Wattage: 25W
• Voltage Output Range: 3.0-3.8V
• Resistance Range: 0.5-0.7ohm
• Single Button Operation
• Intelligent LED Indication Light
• pro-FOCS Coil System - Professional Flavor Optimization Core System
• 0.6ohm Whirl Coil - NiChrome Element 
• Plug-n-Pull Coil Replacement
• Uwell Proprietary Protections
• MicroUSB Charging Port 

Includes:

• 1 WHIRL 20 / 22 Starter Kit
• 1 Replacement Quartz Glass
• 2 0.6ohm Whirl Coils
• 1 Set of O-Rings
• 1 Drip Tip Cover
• 1 MicroUSB Cable
• 1 User Manual