Atlas Learn offers several accessories such as external microphones, infrared receivers, and other replacement parts.

Headset Microphone for Use with Atlas Learn Wireless Transmitters
AL-HSM
Your price (USD):
$78.99
Collar Microphone for Use with Atlas Learn Wireless Transmitters.
AL-CM
Your price (USD):
$85.99
Lapel Mic for Use with Atlas Learn Wireless Transmitters
AL-LM
Your price (USD):
$78.99
Infrared Dome Sensor
AL-IRDS
Your price (USD):
$73.99