Based on this product's specifications, here are some alternatives and similar models
Uninterruptible Power Supply FSP (Fortron) FP 1000 — Line-Interactive UPS 1 kVA / 600 W, 4x Type F outlets, 12 V 9 Ah battery
Summary description:
FSP FP 1000 is a Line-Interactive uninterruptible power supply (UPS) with 1 kVA output capacity and 600 W continuous power. It provides four Type F AC outlets and uses a 12 V, 9 Ah battery with approximately 6-hour recharge time. The unit in a mini-tower form factor (130×320×182 mm, 8.2 kg) protects small servers, network equipment and workstations from mains interruptions and voltage fluctuations.