Compare optis great range of es550c, es800c, es1000c and es1500c units and you will see benefits over other brands. Offering protection for professional usage, like pc server, security system and all necessary equipment for soho, power users and sme(small and medium enterprises), the opti es-c range is the perfect entry level ups for your computer system. Features: regulate fluctuate voltages with avr(automatic voltage regulation). More outlets to backup and/or protect more peripherals against counterparts. Clear status led indicators and audible alarms. 1050 Joules surge energy rating to prevent damage from power surges or spikes. Internet/lan (rj11/rj45) surge protection. User replaceable battery. Cold start to power on ups without input power. Free ups management software included. Specifications: model name: es800c. Inpup: capacity (va / w): 800va/480w. Nominal input voltage: 100/110/120v. Input frequency: 50/60hz auto sensing. Optput: nominal output voltage: 100/110/120vac. Output voltage regulation: rated voltage +/- 25%. Transfer time: 4 ms (typical). Overload protection: circuit breaker(1x0v), fuse (2x0v) nember of outlets: 3 battery backup + 3 surge(us). 3 Battery backup + 2 surge(iec). Surge protection and filtering: automatic voltage regulation(avr): yes. Data line protection: rj11 / rj45. Surge energy rating/peak current capability: 1050 joules. Normal mode noise suppression: full time emi/rfi filtering. User replaceable battery: user replaceable battery: 12v/34w x 1. Typical back-up time (1pc + 1 crt)*: 20 ~25 min. Typical recharge time to 90%: <4 hours. Advance warning diagnostics: front panel leds: ac mode, battery mode, battery fault, overload audible alarms: battery mode, ups fault, overload communications interface: communication port **: rs232 environmental: operating temperature: 0o~40o c / 32o~104o f. Storage temperature: -20o ~ +60o c / -4o~140o f. Audible noise: < 40 dba. Physical: dimensions (wxhxl): physical: 4x6.5X12.7. Packing: 6.6X9.7X14.8. Weight: net: 15.6Lbs. Gross: 16.3Lbs. Conformance: emi/rfi compatibility: bsmi(1x0v); ce(2x0v). Safety: ul/cul(1x0v), c-tick, a-tick(2x0v). * Back-up time varies from equipments attach to and ups battery capacity. Numbers here are for reference. **You can purchase rs232 to usb cable. ***Specifications are subject to change without notice.