Press the button to check the current battery level. Each fully illuminated LED represents 25% battery power, a dimmed LED represents 12.5% battery power, and a single flashing LED represents less than 10% remaining battery power.

When mounted, hold the button for two seconds to wake the device from sleep mode or put it into sleep mode.

When mounted, hold the button for four seconds to turn the device on or off.

When the LED flashes a blue single-blink every 10 seconds, the device is in sleep mode. You can wake the device from the app or by moving the wheel sensor.

When the LED flashes a blue double-blink, the device radio is in active mode and available to connect using Bluetooth^® and ANT‍+^® technology.

When the LED is solid red, a system error has occurred.

During a firmware update:

• When the LED flashes blue continuously, a firmware update is in transfer.

• When the LED is solid or flashes purple, a firmware update is in progress.

• When the LED flashes blue 10 times, a firmware update was successfully applied.

• When the LED flashes red 10 times, a firmware update failed.

While charging the battery, the LEDs light up green.

When charging is complete, the LEDs turn off.

When the battery is critically low, a single red LED flashes.

Pull up the weather cap, and plug in the USB cable to charge the Varia™ Core battery.

Pull up the weather cap, and plug in the USB cable to charge another device, such as a phone.

Replace the weather cap when charging is complete.

Snap the lever to the open position to unlock the battery.

Snap the lever to the closed position to lock the battery into the battery cradle.