| Size | ★★★★★ |
| Weight | ★★★★★ |
| Functions | ★★★★ |
| Battery Years | ★★★★★ |
| Price | ★★★ |
About STL-S300 in Short. Powered by Light, this Tough Solar ladies’ runner’s watch can take you from track to field, walk to jog, run to sprint — just about any activity you pursue. This model takes all of the function of the larger STLS110 and shrinks it down to a smaller size. With 100M water resistance, dual countdown timers for interval training, 1/100 stopwatch and 5 daily alarms, there’s no denying this is one great workout companion.
General Information
| Price | $80 *average Amazon Price, we may earn commission from purchases |
| Year of First Release | 2015 |
| Model Range | Casio Digital Collection |
| Battery Type | Solar Powered (Casio Batteries) |
| Manual | 3440 (official) |
STL-S300 Model Range *may be updated
STL-S300H-1B 
STL-S300H-4A STL-S300H-1A 
STL-S300H-1C
*Want to be the first to know about new Collection Updates? Here we store all recent Monthly Collection Updates →
Casio STL-S300 Display Guide *for key functions only. For you to know how it works))
Timekeeping
- In the Timekeeping Mode, hold down A until the city code starts to flash, which indicates the setting screen.
- Use D and B to select the city code you want.
- Press C to move the flashing in the sequence to select the other settings.
- When the timekeeping setting you want to change is flashing, use D or B to change it.
Stopwatch
The 1/100-second stopwatch can measure elapsed time and lap/split times. Stopwatch times are stored in memory.
– The stopwatch measurement operation continues even if you exit the Stopwatch Mode.
– All of the operations in this section are performed in the Stopwatch Mode, which you enter by pressing C.
Recall Mode
Use the Recall Mode to recall and delete records stored by the Stopwatch Mode.
– Stopwatch records are stored in “logs” that are created automatically by the watch.
– The title screen of the newest log appears first whenever you enter the Recall Mode.
Countdown Timer
Dual timers can be set with two different starting times. The watch can be configured so the two timers alternate, so when one reaches the end of its countdown, the other timer starts. You can specify a “number of repeates” value, which controls how many times the two-timer countdown operation is performed (1 = once, 2 = twice, etc.) The starting time of each timer can be set in five-second steps up to 99 minutes, 55 seconds.
World Time
World Time shows the current time in 48 cities (31 time zones) around the world.
– The times keept in the World Time Mode are synchronized with the time being kept in the Timekeeping Mode. If you feel taht there is an error in any World Time Mode time, check to make sure you have the correct city selected as your Home City. Also check to make sure that the current time as shown in the Timekeeping Mode is correct.
Official STL-S300 Specs / Features *for base version STL-S300H-1A
- Case / bezel material: Resin
- Resin Band
- Resin Glass
- 100-meter water resistance
- LED light
Selectable illumination duration (1.5 seconds or 3seconds), afterglow - Solar powered
- World time
31 time zones (48 cities + coordinated universal time), daylight saving on/off - 1/100-second stopwatch
Measuring capacity: 99:59’59.99”
Measuring modes: Elapsed time, lap time, split time
Memory capacity: Up to 120 records (used by lap/ split time records and log title screens)
Others: lap number (from 001 to 999); Best lap time screen - 2 countdown timers
Can be used during interval training that alternates between two different paces.
Measuring unit: 1 second
Input range: 00’05” to 99’55”
(1-minute increments and 5-second increments)
Other: Number of repeats settable from 1 to 10 - 5 daily alarms (with 1 snooze alarm)
- Hourly time signal
- Battery level indicator
- Power Saving (display goes blank to save power when the watch is left in the dark)
- Full auto-calendar (to year 2099)
- 12/24-hour format
- Button operation tone on/off
- Regular timekeeping: Hour, minute, second, pm, year, month, date, day
- Accuracy: ±30 seconds per month
- Approx. battery operating time:
13 months on rechargeable battery (operation period with normal use without exposure to light after charge)
38 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge) - Size of case : 43×36×11.3mm
- Total weight : 30g
You ask, we answer…
The watch is good for swimming but not for deep diving.
Solar Powered.
Measuring capacity: 99:59’59.99”
Measuring modes: Elapsed time, lap time, split time.