I know at first site this might seem a bit large, but considering it is a Hewlett Packard 5071A Cesium Beam Primary Frequency Reference atomic clock wrist watch, size is a small price to pay for such a trendy time piece.
Please note that you cannot go swimming, take a bath or shower with it on...but who would do that anyway?
The watch keeps time to a few nanoseconds per day. The attractive display is based on 7-segment red LED technology. Batteries are included (they last about 45 minutes but are rechargeable). AC adapter included. There are no adjustments for daylight saving time; however the clock does handle leap seconds and keeps track of the [Modified Julian] date. This HP wristwatch includes 5/10 MHz and 1 PPS outputs. An internal keypad is used to set the date and time. Not waterproof nor even water resistant.
