B07P7JBMC7 IEM-DIGITAL-12 – Professional Digital Stereo/True Dual Mono In-Ear Monitor

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24 bit digital, dual frequency (true stereo) transmitter and receiver
Up to 9 sets are designed to work together without interference
Operating in the 900MHz range, free of TV broadcast and Wi-Fi interference
Rugged, rechargeable all metal body-pack receiver will work with most headphones (each receiver includes ie-9 in-ear headphones)
Battery: built-in Lithium ion 3.7V 1380mAh (Quantity 2 per Body pack receiver)