Your Whistle has an internal rechargeable battery that, in typical use, should last for around 10 days. Click here for more information on checking your battery's status.
2. Attach the cable of the Whistle charging dock to any USB-compatible charging device, such as a powered USB port on your computer, a generic USB charging plug or the Apple charging base that came with your iOS device.
3. Use a dry cloth to gently wipe the charging contact on the underside of the Whistle device.
4. Align the underside of the Whistle device with the Whistle charging dock and wait for the built-in magnet to pull it into place. The light around the Whistle will turn red.
Note: Make sure the Whistle button is opposite the charging cable.
5. Leave the Whistle on the charging dock until the status indicator turns green, indicating the battery is fully charged. This should take about one hour.
Note: If the red charging light does not appear, reset the Whistle by pressing and holding the button for at least 15 seconds. Wait for another 10 seconds, then place the Whistle in its charging dock.