Electronic curtain opener : built-in the clutch, the curtain can be controlled by remote controller or manual.safety and credible, built-in thermal, overload, overtime protection system.AC power input, need not the transformer, can used for 30kg/10m curtain.easy to installation, built-in the receiver and automatic limit sensor system.quiet, stable , sealed lubricate design .it can be used for straight/curve drapery , especially for hotel and family.