These units are designed for collar attachment to birds such as parrots or macaws with strong aggressive bills. These units can also be used on small & medium sized mammals who require a stronger transmitter casing than our normal epoxy coating.


Model Weight Standard Life Lifespan range Dimensions: L x Diameter (mm)
AI-2C 20g 24 months 12-30 months 40 x 15
AI-2C 32g 36 months 24-60 months 46 x 17

Frequency Range: 138 – 235 MHz.

Transmitter: Crystal controlled two-stage design pulsed by a CMOS multivibrator.

Pulse Width (standard): 24 milliseconds.

Pulse Rate (standard): 40 pulses per minute (ppm). Available from 20-120ppm.

Power Output: Set to use available battery power over the required transmitter life.

Activation: Removing an external magnet starts the transmitter. Replacing the magnet stops the transmitter.

Housing: The battery and transmitter are hermetically sealed in a brass case.

Antenna: A flat brass strip forms the antenna and collar.


Temperature (suffix “T”): An increase or decrease in temperature results in a corresponding increase or decrease in pulse rate. At the standard settings, the pulse rate changes from ~15 ppm at 0°C to ~40 ppm at 40°C. Each transmitter is supplied with a plotted calibration curve. This option adds ~0.05g to the finished weight of the transmitter.