The Apple 87W USB-C power adapter, model number A1719, is designed for fast and efficient charging of compatible MacBook computers. It delivers up to 87 watts of power and utilizes the USB Power Delivery (PD) protocol for charging. The adapter is compatible with MacBook models featuring a USB-C port and is often paired with a USB-C charge cable. 
Here's a more detailed breakdown of the specs and features: 
Power Output: 87W.
Input: AC 100-240V, 50-60Hz.
Output: 20.2V/4.3A (USB PD), 9V/3A (USB PD), 5.2V/2.4A.
Connectivity: USB-C.
Compatibility: MacBook computers with USB-C ports.
Charging Speed: Fast charging, capable of charging a 15-inch MacBook Pro at full speed (87W).
Portability: Compact and lightweight for travel.
Safety Features: Includes over-voltage, over-current, and over-temperature protection, as well as short circuit protection.
Other Features: Compatible with other USB-C devices.