These tiny collar transmitters are designed for very small mammals (mice, voles, etc.). Collars can also be configured for birds and bats.


Model Weight Standard Life Lifespan range Dimensions: LxWxH (mm)
BD-2NC 0.50g 12 days 8-15 days 11 x 6 x 4.6
BD-2NC 0.55g 21 days 13-22 days 11 x 6 x 4.6
BD-2NC 0.65g 24 days 17-30 days 11 x 6 x 4.6

Please note: We do not recommend storage for more than 3 weeks prior to use.

Frequency Range:  Limited frequencies in: 164, 165, & 173 MHz ONLY.

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

Pulse Width (standard): 20 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.

Housing: The transmitter and battery are encapsulated in biologically inert epoxy, to resist damage from abrasion and chewing. Battery placement determines shape. The unit is attached to a collar formed by the antenna or a separate wire collar or elastic. A TYGON sleeve covers the wire to prevent abrasion on the animal’s neck.

Antenna: A stranded stainless steel wire covered with a black nylon coating. The antenna may also serve as the collar on some models.

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


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 ~25 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.

Position (suffix “P”): The pulse rate switches from ~24 ppm in a vertical position to ~50 ppm in a horizontal position. This option adds ~0.5g to the finished weight of the transmitter.