The quality and comfort of Pryme's acoustic tube surveillance kits is now available in a listen-only earphone, the Pryme EH-1000 series. The EH-1079X features heavy grade industrial jacketed cable for maximum life in the field and a surgical grade acoustic tube earphone for listening privacy and convenience Features: Listen-only surveillance style earphone for use with two-way radios Acoustic tube earphone provides extreme comfort and a low-profile look Durable construction featuring surgical grade tubing and heavy industrialpolyurethane jacketed cable for maximum life in the field Can be easily concealed under a sport coat, jacket, or other clothing Includes one Flexible Open Ear Insert FREE, as well as a variety of other accessories Modular transducer, cable, and earphone makes the unit user serviceablefor an even longer lifespan Versions are available with both long cable (to plug directly into the radio) or shortcable (to plug into a remote speaker microphone, such as Pryme's SPM-100 orSPM-1100 series) Hardwear Specs: Weight 1.3 ounces Cable Pull Typically 30 lbs Cable Jacket PU Operating Temp -30oC to +75oC Electrical Specs: Frequency Range 300 to 3000 Hz Impedance (Speaker) 150 ohms A 20% @ 1kHz Sound Pressure Level > 80 dB Compatibility:Radios with a 2.5mm speaker jack