An electric brake actuating assembly, including a rotatable actuator and electric drive means for driving the rotatable actuator to rotate, a pair of load transfer members disposed respectively on opposite sides of the rotatable actuator and each load transfer member including three connections A, A1, B, B1, C, C1. A power distributor disposed between the reflective element and reflective element carrier includes an integrated heaterpower supply, a support member having a reverse face and an obverse face, an array of electrically-conductive tracings, and a plurality of discrete contact points for electrical coupling of the array with at least two functional elements. The container carrier includes a universal clamp which permits the device to be clamped to any format of animal pet leash. The MOS differential amplifier circuit so designed can be used in a voltage addersubtractor circuit. Also, the reference current is mirrored to a resistor to provide the reference voltage.