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What makes Sony Xperia M4 Aqua 16GB unique?

Here are 4 unique features & highlights of Sony Xperia M4 Aqua 16GB :
1 The thinnest Sony phone priced around Rs. 18,000
2 The #2 Sony phone priced around Rs. 18,000
3 The #3 phone priced around Rs. 18,000 with the highest RAM
4 The #3 cheapest Sony phone with 16 GB memory