SPECIFICATIONS: Caliber Number V147. Movement Type Solar. Accuracy ±15 seconds per month.

The Seiko Prospex Speedtimer Solar Chronograph watch is 42mm-wide, 12.9mm-thick, and its lug-to-lug distance is 48.3mm, making it reasonably thick for a highly functional chronograph and proportionate to the 42mm diameter. All offer 100 meters of water resistance and 4,800 A/m magnetic resistance for peace of mind.

This solar watch is equipped with a stopwatch function. A full-scale stopwatch, which can measure in 1/5-second increments with the center hand, is equipped. A solar cell under the dial converts any form of light into “electrical energy” to operate the watch. “Chronograph” means a watch with a stopwatch function.

Great time-piece for its price. The Seiko SSc819 is a great option for its price. The solar-quartz movement is reliable and can last a long time without any special maintenance.

10 years The Seiko Solar battery can last up to 10 years, depending on the model and usage. It is designed to be long-lasting and reliable, so you don't have to worry about replacing it often.

The Seiko Prospex watch collection is a high-end luxury sports watch that has caught the eye of deep-sea explorers and avid divers alike. Seiko Prospex watches are well-known for their robust designs and trusted performance.

Some models are expensive for good reason. Seiko and Rolex are the only two watchmakers in the world that make all the parts that go into their watches. While new Rolex automatics are accurate to two seconds a day new Grand Seiko spring drive automatics are accurate to one second a day.

The PROSPEX, as the name implies, simply means “Professional Specifications”.

Solar watch batteries run on renewable and clean energy. Solar batteries can last for (almost!) a lifetime. For example, Solios' solar watches are expected to last up to 50 years. It takes about 2 hours of light exposure to get a more than six months power reserve.

Solar watches are known to be reliable, durable and long-lasting. Kinetic watches are on the other hand motion powered by a battery which gets charged by the movement of the wearer's arm. The watch will have a tiny rotor which will spin as the person wearing it moves, creating the energy necessary to fuel the battery.

But all Seiko 5 watches share one thing: they're surprisingly affordable. Seiko 5 is a budget automatic watch, through and through.

around ten years This, coupled with wear throughout the year, has meant I've never come to them to find they have died. But of course, a battery, even a rechargeable one, does have a finite life span, and Seiko says this is around ten years. So ten years of worry-free accurate timekeeping is what you can expect from these movements.