SOLAR QUARTZ MOVEMENT: EPSON VS17A
Hour + Minute + Center-Second
Specifications:
Movement dimension: 
Size (ligne):   5 1/2'''
Height (mm):   2.79
Time Standard:
Frequency of quartz oscillator:    32'768 Hz
Accuracy:   + - 20 seconds per month
Operating temperature range:   - 5 degrees C to + 50 degrees C
Indicator / Functions:
3 Hands with Reset switch:    Hour / Minute / Second
Setting mechanism / MANUAL: Crown at normal position: Free
Crown pulled out 1st click: Time setting / Reset
Power depletion warning function:  Second-hand moves at 2-second intervals when voltage is 1.10V
Running time: Approximately 6 months (After fully charged)
Features:
Jewels:  2 Jewels
Anti-magnetism:  Over 1'600A/m (Direct current magnetic field) Driving current consumption Approx. 0.40microA (1.35V)
Operation stopping voltage:  1.0 V
Solar Cell type:   Amorphous silicon solar cell
Secondary Battery. This secondary battery is without any environmentally harmful substances! Do never set and charge a silver oxide battery, there is a possibility of battery explosion!
Type:  Titanium-lithium-ion secondary battery
Lifetime:  8 - 10 years
Size:  Diam. 5.80 x t 1.65mm
Nominal voltage:  1.5 V
Capacity:  1.8 mAh
Charging time:
By fluorescent lamp, inside the office (700 Lx):   impossible for a full charge, 45 hours to operate steadily
By fluorescent lamp, 30W / 20 cm (3'000 Lx):   ~85 hours for a full charge, 10 hours to operate steadily
By Sunlight, cloudy weather (10'000 Lx):    ~25 hours for a full charge, 3 hours to operate steadily
By Sunlight, fine weather (100'000 Lx):    ~4 hours for a full charge, 25 minutes to operate steadily
Overcharge prevent function:    An overcharge prevents function is equipped to avoid deterioration and breakage of the secondary battery.