Hello! The red LED will flash if your headset is about to die, will be solid when you plug it in to charge. If it is fully charged, it will be solid blue.
When you turn it on and go to pair it with your device, it will be a lavender or purple color then alternate flashing between blue and red. Once paired, it will be a flashing blue and will continue to flash as you're using it.
You can do up to 5.5hrs of Solid playing music...if you're inactive with it for a while, it does have a power-saving mode which will turn it off. Just turn it back on, hit play on your music device and you're back to listening again.