What is the difference between the Joyetech Atopack Dolphin and the Atopack Penguin?

Joyetech ATOPACK Dolphin Starter Kit

Joyetech Atopack Dolphin is a compact pod style vaping kit with an elegant dolphin shape. It has a built-in 2100mAh battery and option 6ml/ 2ml cartridge. You can check the e-juice level through its transparant tube and battery level with its five-level indicator. The JVIC system brings you perfect vaping enjoyment, both for DL and MTL. User will find the sweet spot

features:
Built-in 2100mAh li-ion battery
Newly added 1.2 ohm head for MTL enthusiasts
2A quick charge and cool lights design
Invoke the spirit of the dolphin
High build quality and ergonomics
Compact pod mod with stylish design
Innovative JVIC coil system
Flexible e-liquid filling way

Click to see Joyetech ATOPACK Dolphin Replacement Cartridge

Joyetech ATOPACK PENGUIN Starter Kit

The ATOPACK Penguin comes neatly packaged and has everything you need to start vaping, minus the e-liquid. The mod looks like it’s made from zinc alloy. Ergonomically the device is a joy, fitting perfectly in the hand with smooth, rounded edges and corners. The device packs a 2000 mAh internal battery, and comes with a unique, refillable cartridge system. This holds 2mL of e-liquid. Joyetech has developed a new coil system they call JVIC (Juice Vertical Injection Coil) for the Penguin. The little fella comes with two different coils, at 0.6 ohm and 0.25 ohm and vapers will have the option of Mouth to Lung or Direct to Lung vaping depending on the coil they choose, 0.6Ω for MTL and 0.25Ω for DTL.

Atopack Penguin Kit Features:
Dimensions: 26.5*52*102.5mm
All-in-One Device
Simple One Button Design
Maximum Output Wattage: 50W
E-Liquid Capacity: 8.8ml
Built-in Battery Capacity: 2000mAh
Battery Life Indicator Light
ATOPACK Cartridge with JVIC - Juice Vertical Injection Coil
Utilizes JVIC Kanthal Atomizer Head with Ceramic Cradle
Side Micro USB Charging Port
Maximum Charging Current: 2A
Short Circuit Protection, Low Voltage Protection, Low Resistance Protection

Order Joyetech Atopack Penguin Kit Now!

Summary
The coil and the airflow reducer are enough; the Penguin couldn't really do MTL. That assumes that the airflow reduction actually takes it down to a proper MTL (Joyetech doesn't have a great record there).