If you own a HTC phone, most probably you would have noticed a red and green indicator LED. WPCentral has pointed out that it is nothing new and it also exists on every HTC Windows Phone. So, what does it do?
Based on the information, the red and green indicator will appear when you charge your phone or when your battery is low. Green means fully charged.
The LED is a red/green combo that will flash red when the battery is low, when the battery is charging and turns green when the battery charge is complete or when you miss a call. It does not light up on new email messages or SMS messages. There are no settings to customize the LED light but who knows what the future may bring.
No wonder HTC slogan is ‘Quietly Brillant’.
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(source)