Q: What wavelength do the IR emitters and receivers use? Can the emitters be used to transmit signals through the plastic walls of a chamber?

A: 940nm. Polycarbonate is generally transparent at this wavelength: the signal can pass through several standard transparent mouse home cages so long as there are no obstructions between the emittter and the animal. Opaque barriers should be placed between chambers if they should not be receiving the same pulse trains at the same time.

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