The ES-124U is a low-cost clock for applications not requiring GPS or temperature controlled stability. The ES-124U Uses the AC line-frequency as a time reference or, ly, a quartz crystal timebase may be specified. A Set/Select toggle switch for setting is accessible on the rear of the case. FeaturesA crystal reference is employed for those applications requiring independence from the line frequencyThis option consists of a connector wired to switches on a control plate via a six-foot cableAn ESE Time Code output (TC90) is provided allowing the unit to drive ESE Time Code SlavesThe unit is configured to operate from 220 VAC line voltage. 117 VAC 50/60 Hz is standardDesigned for mounting into a standard equipment rackAllows specific units to be mounted side-by-side on a single Rack Mount panelThe unit is supplied with a UL/CSA approved wall mount power supplyRecommended where static charges can occurStandard on many units, otherwise a 2-wire cord is suppliedSpecificationsWeight: 3 lbs