Switch the Snuza Hero OFF. Remove the battery for 10 seconds and do not press any buttons while the battery is out. Place the battery back in the Snuza Hero. Do not switch the Snuza Hero ON. Does the Snuza Hero start alarming with the Battery Indicator Light flashing red? If yes, then If the Snuza Hero is still under the twelve month guarantee contact Customer Care by completing the form on the contact us page.