Red/Blue flashing means it is in pairing mode and needs to connect to your device. This can happen if you hold the power button a second longer after powering on. To avoid this, have the earbuds on and a soon as you hear the power up tone, let go (no need to hold on to the button throughout the powering up tone, if you do, it will register a long press and go into pairing mode). If you already have it paired but accidentally turn on pairing mode, simply hold the power button down to turn off your headset, then turn it back on.