The Vaptio C Flat is an all in one compact pen-style vape device with a built in 350mah rechargeable battery. Stylish and ergonomic, the C-Flat was designed to be a simple user friendly device. The C-flat replaceable cartridges feature a 1.5ml capacity and utilizes a 1.0Ω coil. The pods are easy to fill with a unicorn bottle through the hole on the top of cartridge. Simply remove silicone plug, fill and put plugged back in for leak proof design. The C-Flat adopts a user friendly one button control interface for easy operation of device as well as both MTL (mouth to lung) and DL (direct lung) vaping styles. Simple press button upwards for MTL and push button downwards for DL vape. C-Flat is a pass through device that employs a USB charging port for convenience and on the go vaping. No waiting for charging of batteries with the C-Flat. This pen device can be vaped while being charged!