This is an “Ortovox D1 Dog Receiver” which is an avalanche receiver paired to an avalanche tramsmitter (the green plastic square). The transmitter goes into the small textile collar-bag at top left.
The Ortovox D-1 Dog Transmitter and Receiver is no longer made, but back in the day it could be had for about 278 Euros or about $342 US.
From the original literature from 20 years ago:
The Ortovox Earth Dog Transmitter is fastened on the dog's collar and sends a radio signal. The Orotvox Dog Receiver receives the signal. The shorter the distance between transmitter and receiver the louder the tone gets. With the rotary switch you can change the range and search area from 40m to 1m (43 yrds to 1 yard). Also, navigation is aided by three colored LED lights.
Avalanche transmitter technology has been around since the 1970s. The main change in the last 20 years has been the rise of digital receivers with little arrows and LED read-outs which make operation of these systems more user-friendly for those who rarely use them.
Though many of the receivers are now digital, the signals are still analog, and they all operate on the same frequency (457 Khz) which means any avalanche transmitter can work with any avalanche receiver, regardless of manufacturer.
The 457 Khz frequency is an international standard that was put aside for rescue devices in 1968. This relatively low frequency (just below the AM dial on a radio) was chosen for rescue work because the signal is relatively unobstructed by walls, concrete, snow, ground, and human bodies, etc.
I believe the Bellman and Flint terrier telemetry rig, uses an avalanche receiver and 457 Khz transmitter Pieps DSP (digital signal processing) box as their locator.
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