Heathkit SA-5010 uMatic Memory Keyer Speed range: 1 to 99 wpm Character spacing: less than or equal to speed setting Number of buffers: 1 to 10 (may be used to store text or commands) Buffer size: 240 characters plus commands Weighting: normal plus 5 light and 5 heavy settings Auto message repeat: 0 to 9 (sent 1 to 10 times) Keyer output: solid state, +250 volts @ 100ma, -200 volts @ 40ma separate protected output jacks Memory backup: 3 watch batteries Paddles: built-in (removeable) capacitive "touch" type with provision for external mechanical paddles Sidetone: Approximately 300 to 1500 Hz adjustable Power:11 to 16 volts DC @ 200ma Dimensions: 1 5/8" H x 4 1/8" W x 6" D