Special order model, black Solar Tech radio pocket watch. A limited edition model with a black finish including the case, dial, and Arabic numerals. The 41mm diameter case makes it easy to see the time without getting in the way. It has a chain with a hook, so you can safely put it in your jacket or pants pocket. The design elements are also made with great attention to detail, and are only available here. Solartech radio clock, case material: stainless steel, accuracy: ±15 seconds/month (when not receiving data), waterproof for daily life (3 ATM water resistant), photovoltaic power generation: runs for about 2 years when fully charged, power save, perpetual calendar, Scheduled reception function, forced reception function, charging warning function, overcharging prevention function ['Solar Tech' does not require regular battery replacement] A function that converts light into electrical energy to drive the clock. It charges using light such as the sun, so there is no need to regularly replace batteries. Once fully charged, it can be used for approximately 2 years (when power save is activated). Since the battery uses light as energy, if you store it in a place that is easily exposed to light or light, it will not run out of charge and can be used stably. [ Radio clock that automatically adjusts the time] Receives standard radio waves transmitted based on the atomic clock, which is said to have an error of 1 second every 100,000 years, and automatically adjusts the time and calendar. You can obtain accurate time by receiving radio waves transmitted from two locations: Fukushima station and Kyushu station. [REGUNO] REGUNO is a simple standard watch at an affordable price. We offer a complete lineup of men's, women's, pair, and pocket watches. We have a wide range of products that can be easily purchased by anyone, regardless of age, occupation, or gender, so that REGUNO is always in the ``regular place on your arm''. [About charging Solar Tech] Charge by exposing the dial to direct sunlight or fluorescent light. Tips for charging: Place the watch in a bright place where the dial is exposed to sunlight even when the watch is removed. Your watch will continue to work properly when you put it on/ Charge it by exposing it to direct sunlight once a month. If you want to store it in a place that is not exposed to light, please fully charge it before storing it. /Charging warning function: Please charge when the hand moves to 2-second intervals. *You can also check the instruction manual pdf on the manufacturer's website.