The carillon has worked in sheltered at a maximum distance of 20 meters and through 2 doors during installation Unfortunately 24 hours after he was no longer working in free field and at a maximum distance of 2 meters and only by raising the Issuer to 2 meters above the ground. The transmitter battery is not the cause after checking to 12.36 v to 12v workforce; I return the defective product for a refund.