Active Noise Cancelling, IP67 Waterproof & Heavy Duty Microphone – This speaker mic. delivers in many areas. Rugged enough to be totally submerged in water and tough enough to withstand years of wear and tear. Public safety or industrial use ready Tested to Military Standards MIL-STD810G. This Speaker Mic # 8 has many special features. Flame Retardant, with a Front Large PTT or a standard side PTT. Volume can go very loud and be crystal clear. The speaker is waterproof and has Spark Guard protective membrane. Dual-Core Active Noise Cancelling for improved sound in high-noise environments. Comes standard with a top Nexus Audio Port and a side 3.5mm audio port. It also has an Emergency Button on top.