Classify the following sentence into an iOS accessibility feature from the following list: Speech Synthesis, Visual Analysis, Hearing Aid Compatibility, Physical Sensors. Output should be one of the four corresponding numbers.
The iPhone can read text aloud.
1. Speech Synthesis
Complete the following task based on the instruction and optional input provided.### Instruction:
Classify the following sentence into an iOS accessibility feature from the following list: Speech Synthesis, Visual Analysis, Hearing Aid Compatibility, Physical Sensors. Output should be one of the four corresponding numbers.

### Input:
The iPhone can read text aloud.

### Output:
1. Speech Synthesis