Features: SOLAR POWERED: Energy saving, no wiring to install, stick and play. PHYSICAL REPELLENT: No poison, no chemical, repelling pest via sonic wave, safer to use. 400? PROTECTION AREA: Repel pest within 400?, practical for garden and farm. 120HR WORKING TIME: 600mAh high battery capacity support 120hr constant working. REPLACEABLE BATTERY: Battery can be replaced to extend service time.