Specification
 
Current Time Mode
• Hour, Minute,Second display
• Month, Data, Day of Week display
• Auto Calendar from 2000 to 2099
• 12/24 hour format
• Month/Date or Date/Month display
• Hourly Chime
• Daily Alarm
• Temperature Display
 
Chronograph Mode
• Resolution : 1/100 second
• Range : 99 hours, 59 minutes, 59.99 seconds
• Split Time function
 
Countdown Timer Mode
 Resolution : 1 second
• Range : 99 hours, 59 minutes, 59 seconds
• Beep once per minute for last 10 minutes
• Beep once per 10 seconds lor last minute
• Beep once per second for last 5 seconds
• Beep for 30 seconds when countdown to zero
Dive Mode
• Sea or Lake diving site selectable
• Automatically activate/deactivate Dive Mode when submerge or emerge  1.5m  of water depth.
• Current Dive duration. Depth and Water temperature display
• Depth Unit : meter or feet selectable
• Depth resolution: O.lm/0.1 ft
• Maximum Depth: 100m / 328ft
• Dive Alarm when emerge faster than 6m/minute
• Automatic Dive log memory
Temperature Display
• Unit :°C ,°F selectable
• Resolution : 1°C / 1°F
• Range: -10°C to +60°C / 14°F to 140°F
 
Dive Recall Mode
• Maximum 100 records to be recorded and recall
• Each dive record col'llalns:
   Starting Time and Date
   Dive Duration
   Maximum Dive Depth
   Minimum Water Temperature
   Dive Site Indication
• Delete current/previous/all records function
http://www.keilar.ee/eng/products/493/53/snorkeling_master_10at.html
А здесь инструкция на английском:
http://www.keilar.ee/uploads/Products/product_493/SnorkelingMaster.pdf