Bordnetzunabhängig by operation with two commercially available 3-volt button cells (CR2477), particularly long runtime of about 24 months per battery set. Ideal for long-term parkers such as classic cars, motor homes, exhibition vehicles. Universally applicable in car, house, garden, attic or carport. Recommended before any marten repellent measure - STOP&GO scent mark remover, item no. 903945.