TempGuard models (NOR-5L416TG, NOR-5L756TG, NOR-5L1006TG) are identical to their standard counterparts in capacity, shelving, and door configuration — with one addition: a built-in LiFePO₄ / VRLA battery backup that automatically maintains 2–8°C for up to 8+ hours during a power outage. No external UPS box, no second power outlet, no special installation. If your site has unreliable power or if cold-chain interruptions carry significant stock-loss risk, TempGuard is the appropriate choice.