Radio Controlled Movement sweep second hand quartz clock movement alrm clock movement WWVB Radio ... Movement, step movement Specifications:Model NO.: DM7920 (WWVB) - Sweep Second HandSize(MM): 78x65x20Other Relative Models:DM7820 (WWVB) - Step MovementDM7810 ... . Operating current consumption:<160uA5. Time accuracy(standard deviation):±1 second.year6. Decoding time: 4 to 20 minutes7. Rectifying times ...