The Kodo is an ultra compact cartridge battery mod.  The Kodo measures just 2.09 inches tall, 0.79 inches wide, and 0.69 inches deep making it possibly the smallest cartridge battery mod available today.  To keep things simple the cartridge screws directly into the device.  The engineers were able to shoehorn a big 400mAh battery into this tiny device and you can recharge it fully in 30 minutes with a Micro-USB charger.  The Kodo may be small, but you still get big features like Variable Voltage and a convenient Preheat setting.  Size does matter, and if you are looking for a compact and discreet device, the Kodo is the perfect solution!