Electricity & Electronics
Voltage & Frequency: United States standard 120 volts AC, 60 Hz
Plug Types: Type A and Type B (American standard)
- Type A: Two flat parallel pins
- Type B: Two flat parallel pins plus round grounding pin
Adapters Needed:
- Visitors from Europe, Asia, Africa, Australia, and most other regions will need plug adapters
- Many modern electronics (phones, laptops, cameras) have dual-voltage chargers (110-240V) and only need plug adapters, not voltage converters
- Check your device's power adapter for voltage compatibility look for "INPUT: 100-240V"
- Hair dryers, straighteners, and other heat-producing appliances often require voltage converters if not dual-voltage
Where to Buy Adapters:
- Purchase before arrival for best selection and prices
- Available at SFO Airport shops (expensive)
- Target, Walgreens, Best Buy, or hardware stores throughout SF
- Many hotels provide adapters upon request ask at front desk
USB Charging:
- USB outlets increasingly common in hotels, airports, cafes
- Bring USB cables for your devices
- Portable power banks useful for full day exploring
Important: Using incorrect voltage (plugging 120V-only device into 240V or vice versa) can permanently damage electronics. Always verify voltage compatibility, not just plug type.