The Audio-Technica AT8539 power module allows any Audio-Technica Wireless Essentials® microphone to operate as a wired microphone. The power module's HRS-type 4-pin input connector mates with any Audio-Technica Wireless Essentials® (wireless microphone with model number ending in a cW); its output is a standard 3-pin XLRM-type connector.
It offers a low-cut filter to help minimize the pickup of unwanted low frequencies. To engage the low-cut filter, use the end tip of a paperclip or other small pointed instrument to slide the switch toward the "bent" line.
The power module is constructed of rugged steel for maximum durability and optimum shielding from hum.
Shown above with the Audio Technica ES943C mic (not included).