Hugo Battery Backup for Tankless Water Heaters and Gas Appliances Tankless battery backup Up to 7 days of normal operation Pure Sine Wave output 500VA/350W Indoor/outdoor Installation Can be used for other non-flow gas/electrical appliances 5 hours of continuous operation Portable or permanent mount Indoor/Outdoor installation IP54 grade for all-weather protection 35Ah AGM non-spill battery Sound/Visual alarm LED indicator for easy troubleshooting Flow sensor switch to prolong battery life Maintenance free operation Anti-Frost assist Auto activate within 8ms upon power outage Auto reset when main power becomes available Auto switchover between main power and inverter mode Built-in fuse to prevent board burnout and to protect downstream appliances Solar capable SMART technology to ensure constant clean power PURE SINE WAVE Technology Output: 500 VA I 350 W