"Wireless rain gauges are the new era. No more running outside to read and empty collection devices. With these digital devices, everything you want to know is available. Daily or monthly histories, digital or graphical. Rainfall alarm. Indoor temperature. Time and date. Just place the collector funnel outdoors in a suitable and appropriate place up to a maximum 100m from display unit. Powered by 4 x 'AA’ batteries (not supplied). Quality instrument made in Germany."