The term "RC-44 GAN Charger 44w, 55w, 67w support (with 44w PD) Type-c" likely describes a GaN-based charger, but it does not correspond to a specific, widely recognized brand or model. It is more likely a generic or unbranded product name found on marketplaces like Daraz.com or Amazon. 

Here is a breakdown of what the specifications mean:

RC-44: This is likely an unbranded model name and not a standardized product number.

GaN Charger: This specifies that the charger uses Gallium Nitride technology instead of traditional silicon. This allows for a more compact, efficient, and faster-charging device with better heat dissipation.

44w, 55w, 67w support: This indicates that the charger can deliver power at different levels depending on the connected device's requirements. This is often the case with modern chargers that can adapt their output.

44w PD: This refers to Power Delivery (PD), a universal fast-charging protocol. The charger can output 44 watts using this standard. This is significant because many different devices, including some phones and laptops, use the PD protocol.

Type-C: The charger has a USB-C port for its output, which is the current industry standard for fast charging. 

How to use this charger

When you plug a device into this charger, it will automatically detect the optimal charging speed.

For a device that supports 44W PD, it will charge at that rate.

For devices with other protocols (like Vivo's FlashCharge or Xiaomi's fast charge), it will negotiate the correct 55W or 67W speed if the device is compatible and the charger supports that proprietary protocol.

For other devices that don't use these specific protocols, it will charge at a slower, safe speed. 

Considerations for unbranded chargers

Since this appears to be a generic product, be mindful of the following:

Safety: While most modern chargers have built-in protections, generic brands may have less reliable components. Look for safety certifications like CE or TÜV confirmation.

Compatibility: Some charging protocols (like Vivo's 67W or Xiaomi's 67W) are proprietary and may not be fully supported by all chargers, even if they claim to be. For the fastest charging, it is often best to use an original charger from the device's manufacturer.

Performance: The advertised speeds may not be consistently delivered for all compatible devices. Performance can vary between generic chargers and high-end branded ones like those from Anker or Baseus.