A 45W MagSafe power adapter for MacBook Air has an input of 100-240V, 50-60Hz, 1.0A and an output of +14.85V, 3.05A, delivering a total of 45W. It features a MagSafe 2 connector, also known as the "T" connector. The adapter is designed for MacBook Air models and includes a power indicator light (amber when charging, green when fully charged). 
Key Specifications:
Wattage: 45W
Input Voltage: 100-240V, 50-60Hz, 1.0A
Output Voltage: +14.85V, 3.05A
Connector: MagSafe 2 ("T" connector)
Power Indicator: Yes (amber when charging, green when fully charged)
Compatibility: Specifically designed for MacBook Air models
Dimensions: Height: 6.3 cm (2.5 in), Length: 6.3 cm (2.5 in), Width: 2.9 cm (1.1 in)
Cable Length: 1.78 m (5.83 ft.)
Weight: 180.0 g (0.40 lbs) 
Additional Information:
The adapter recharges the battery while the system is on, off, or in sleep mode and can also power the system without a battery. 
It is a suitable replacement for the original 45W MagSafe 2 adapter for MacBook Air. 
It is recommended to use the adapter in a dry, cool place and avoid using it during thunderstorms. 
It is not recommended to use a charger with a different voltage or wattage for replacement.