MAXTOP ASK4032-I2 2-Wire Acoustic Ear Tube Surveillance Kit for ICOM IC-F11 F21 IC-F3000 F4000 A first step for our customers who chose to go w/ 2-wire earpiece Dual-wire design earpiece to further handle extremely tough conditions Further enhanced comfort with single operation for each individual wire Experience the comfortability of our extreme soft acoustic tube, and easily replaceable Measured Length from Connector - Earphone: 113cm (44.5 in), Stretch Comfortably to 122cm (48 in)