DTMCare Bird Repeller. Scaring off animals through visual and audio signals Scariring off birds through visual and audio signals. The special effects scarecrow can be used to gently drive away birds without any chemical means. The alarm transmitter, the ultrasonic signal transmitter and a stroboscopic flash can be swithced on in the different operating modes. These signal gtransmitters are activited by the 90 degree motion detector switch. Wall-mounting is possible.