The Microsoft Surface Pro 48W Power Adapter is the official power supply standard specifically designed for early-generation Surface tablets.
Key Specifications
Output Power: 48 Watts
Output Voltage/Current: 12V at 3.6A (or 3.58A)
Connector Type: Old 5-pin magnetic connector interface (not the modern, elongated Surface Connect port used on Pro 3 and newer).
USB Port: Includes an auxiliary 5V / 1A (5W) USB-A port on the brick to charge external accessories like phones.
Device Compatibility
This specific 48W charger is strictly compatible with the following legacy models:
Surface Pro 1
Surface Pro 2
Surface RT / Surface 2