Belkin BoostCharge USB-C to USB-C Cable 240W, as the product name suggests, is a USB-C to USB-C charging cable that is capable of delivering up to 240W of power through it.
Extended Power Range (EPR) is part of USB Power Delivery (PD) 3.1 specifications that allow USB-C cables to deliver up to 240W of power. The previous USB PD 3.0 specification provides up to 100W.