MOTOROLA RLN5883A TWO WIRE KIT M7 FOR DP3400 DP4400 ETC - NEW. Fits: DP3400, DP3401, DP3600, DP3601, DP4400, DP4401, DP4600, DP4601, DP4800, DP4801 AND ALL “E” VERSIONS. Type: Two Wire Covert. The earpiece is equipped with a push-to-talk (PTT) button and an integrated noise-cancelling microphone.
eBay