Your product is in Lockout Mode to protect it from accidentally turning on during shipping.
If you have a Range 300, press and hold the button for 5s to exit Lockout Mode.
If you have a Range 400 or Range 500, press and hold the larger button for 5s to exit Lockout Mode. We recommend putting your product in Lockout Mode any time you are packing it in a bag. Press and hold the button for 5s to re-enter Lockout Mode.