large remote speaker microphone is easy to operate even while wearing gloves Features IMPRES audio which optimizes your audio when operating in noisy environments. Wind porting feature is specifically designed for windy outdoor environments and dramatically reduces the noise caused by howling winds and harsh weather This microphone also has a volume switch, programmable orange emergency button and side programmable button. Compatible, APX 4000, APX 6000, APX 6000XE, APX 7000, APX 7000XE, SRX 2200