These are the new Temperature control iSticks. This means this iStick can handle any temperature controlled devices AND any other device 510 or eGo device you may have (ego's require the istick adapter or any 510 to ego adapter)
What does temperature control mean? Simply put newer devices on the market (2015) are coming out with temperature sensitive coils and ned devices that can accurately read the temperature generated. This is a safety feature. It does NOT mean other non "TC" devices are unsafe, simply that using this device with a TC coil is possible. You can use this iStick as you would any mod.