Price adjusted due to changes in battery condition. EPSON GPS Running Watch MZ-500, SF-720, and SF-810 - Set of 3 + 3 chargers each These were used for running, etc. *Price reduced because the battery of the SF-720 seems to have deteriorated since the item was listed. Current operating times: MZ-500: Log confirmed for 28 hours in R6.9, and 22 hours in R6.11. I think it can probably still log for nearly 30 hours. SF-720: Log confirmed for 10 hours in R6.8. I think the battery has deteriorated, so it can probably log for about 5 hours. SF-810: Not used recently. It may only be able to log for about 1 hour, so please consider it as an extra. These are all estimates, and the operating times are not guaranteed. Each watch was used, so they have been cleaned, but there are dirt, scratches, and scuffs. However, there are no major scratches or cracks that would make the screen unreadable. The chargers are 1 for MZ and 2 for SF. One of the SF chargers is unused. No price reduction. EPSON GPS watches have been announced by the manufacturer to discontinue services, etc. Please check the manufacturer's website for details.