The unit is useful thoughtfully with a replaceable Li-Ion battery 3.7V (unscrew rear) and a monocrystalline solar panel 4.5V-equipped, which can load a maximum of about 150mA. The build quality is satisfactory, but not great. In English. Quick Start Guide is that one before startup (or testing) necessarily real glaring-bright spotlight cover (!) Is in order not to damage his eyes. The small, unlit LCD display can then be read for a few seconds (battery indicator in bar, ambient light on threshold in lux, which increases the value each time you press +1 and ditto. For the burn time in seconds (10-99s). Then goes the LCD display automatically. Important: If the unit off in the middle of the power button and turned on again automatically the default values loaded (10s burn time, switch-on of the PIR at 220 lux in advanced dusk), but what I find useful on a wall or stair access to save battery power, because in the winter months, the charging time is short! Other manufacturers were partly to 6V lead-acid batteries with completely undersized solar panels that are no longer able to load enough later than in late autumn. I just so disposed of one thing after 2 years and constantly recharging the power supply in winter.
