Battery to Electric AA Converter - Convert Any AA Battery Clock/Device to Electric - NiMH Battery Will Keep Your Clock/Device Running in Case of Power Failure ADAPTS BATTERY OPERATED CLOCK/DEVICE FOR ELECTRIC USE. Just replace your AA battery with the AA-size NiMH battery on the adapter. Plug it in and you're running on electric power! It's that simple. PROVIDES UNINTERRUPTED BATTERY BACKUP - If your power goes out, the converter will automatically operate as a power back up and operate your clock/device for up to 3 weeks. Once power is restored, the converter automatically switches back to electric and then re-charges the NiMH for the next outage. QUALITY CONSTRUCTION  Every J. Thomas product is made with quality materials. Every product shipment we receive goes through a rigorous QA (Quality Assurance) process, so you can be sure the item you receive will work the very first time and for years to come. TECHNICAL SPECS: Built with a six foot extension cord. Our converter can use any standard U.S. outlet - 110-240 VAC, 50/60 Hz. Our converter is for indoor use only. Designed to replace a single AA battery clock or device. Not recommended for use with a multi-battery clock or device. THE J. THOMAS GUARANTEE - If for any reason, you are not completely satisfied with your purchase, just contact us for a full and complete refund! With J. THOMAS you can buy with confidence: We have been in business for over 12 years and have THOUSANDS of satisfied and happy customers!