Two 20700 cells are included in the box, optional support for your 18650 batteries as well.

Features

• Dimensions: 101.8mm by 57.9mm by 31mm
• Dual 20700 High-Amp Battery
• Optional Dual 18650 High-Amp Battery w/ Sleeve Adapter
• Maximum Wattage Ouput: 234W
• Minimum Atomizer Resistance: 0.06ohm
• Temperature Control Range: 200-600F
• Ni200 Nickel , Titanium, and Stainless Steel Compatibility
• Vertical Display Layout
• Intuitive OLED Display
• Oversized Square Firing Mechanism
• Short Circuit Protection
• Over-current Protection
• Over-voltage Protection
• Overcharge Protection
• PTC Protective Circuits
• MicroUSB Port
• Spring-Loaded Stainless Steel 510 Connection

Includes

• 1x  Captain PD20700 Mod 234W
• 2x  iJoy 20700 Batteries
• 1x  18650 Sleeve Adapter
• 1x  Micro USB Cable
• 1x  User Manual