A charger with the features "RC-33 GAN Charger 33w, 40w, 45w support (with 33w PD) Type-c" is a type of fast charger built with Gallium Nitride (GaN) technology, designed for efficient and compact performance. It typically features a USB-C port for power delivery (PD) and can be marketed under different brand names, with the specifications being the key identifiers. 

Key features

GaN technology: GaN chargers are smaller, lighter, and more energy-efficient than older silicon-based chargers. They generate less heat and can charge devices faster.

Multi-wattage support: The "33w, 40w, 45w support" indicates that the charger can dynamically adjust its power output to safely charge a variety of devices, including smartphones and tablets.

33W Power Delivery (PD): The USB-C port supports up to 33W using the Power Delivery protocol. This is a common fast-charging standard used by many devices, including iPhones, iPads, and Android phones.

Type-C port: The charger comes equipped with a USB-C port, the modern standard for fast charging and data transfer on many current devices. 

Who is this charger for?

Travelers: The compact GaN design makes it easy to carry for charging on the go.

Owners of multiple devices: Since it adapts its charging output, it can be used for a wide range of devices that support various fast-charging standards.

Users of recent smartphones: It is ideal for charging newer phones that support PD protocols, such as recent iPhone and Xiaomi models. 

Before you buy

Check compatibility: While the charger has broad support, ensure that your specific device and charging cable support fast charging to maximize its potential.

Maximum power output: Note that some listings for these types of chargers indicate that the full advertised wattage (e.g., 40W or 45W) is achieved only with specific charging protocols or on certain ports. When using the PD port, the maximum is 33W.

Laptop limitations: Many 33W chargers are not powerful enough to charge laptops efficiently, especially those with larger battery capacities.