Features: Long-term online floating charging of batteries, with high charging efficiency, and the battery fullness can reach more than 90%. Self-stop when fully-charged to prevent overcharge of the battery and effectively prolong the service life of the battery. Automatic switching of AC-power and battery, no switching-time, unattended. Cold start function can directly start UPS with battery if there is no AC-power to meet the crashed need of users. Quality material, with voltage-resistance and insulation-resistance, safe and reliable to use. Specifications: Material: Metal Output: DC-voltage: CH1 27.6V, CH2 26.5V Voltage-tolerance: 1% Rated-current: 4.0A, 0.30Amp Current-range: 0~4Amp Power: 118.4W Text-wave and noise: 180mvp-p Adjustable range of DC-voltage: CH1 21.3~29.8V Input: Voltage-range: AC90~264V, DC127~370V Frequency: 47-63Hz AC-current: AC2.8A115V, AC1.4A230V Efficiency: 83% Impulse-current: cold start current AC30A/115V, AC50A/230V Leakage-current: less than AC1mA/240V Protections Characteristics: Overload-protection: rated-output power 110%-115% start overload-protection; protection-mode: AC-charge mode, hiccup-mode auto-recovery after fault conditions removed Battery Low-voltage Protections: 20-22V; ; protection-mode: cutoff output Note: Please allow 0-1cm error due to manual measurement. Please allow for slight color difference due to different monitor resolution. Package includes: 1Pc SC-120W-24V UPS Switching Power Supply