HCX-3 portable phone magnet 

 HCX-3 portable phone magnet performance: a match to be re-light lines. 800Hz phone impedance 800Ω ± 20%. Model 2 with two telephones on the pass, even in less than 75db audio noise conditions, the communication distance of up to 21 km. 3 in the temperature -40 ℃ (with cold batteries) - +50 ℃ 750 ± 30mmHg pressure and temperature of +40 ℃, relative humidity up to 98% of the reliable work environment. 4 All 
 Parts fixed on a rack into one, with a cell phone into the case, the structure of a solid, portable and easy to use. 5 phone volume: 222X195X107 (mm) 3 Weight: about 2.5Kg 65-1 portable magnetic properties of a telephone handset products 800 ohms nominal impedance, designed to be used for light double-track lines, such as the use of ultra-light is double-track, side-tone the larger. 2 phone frequency band of 300-3400Hz. 3 Send reference attenuation: use of the battery voltage is 3V +4.0 - +1.2 N. Receive reference attenuation is -0.8 ± 0.25N. 4 in 75db noise environment, to exchange the same model phone, the call is re-line a distance of 24 km of light. 5 bells Sensitivity: 75db noise level in the environment and light conditions were 30 km double-track, two telephones each with the same type of rock generator, ring tones can be heard from 2 meters. 6 machine box: thermoplastic repression, durable. 7 use of the environment: Ambient temperature: -40 ℃ - +50 ℃ range. Relative humidity: up to temperature of +40 ℃, relative humidity 95 + 3% atmospheric pressure: the 760--780 mm Hg change in the height range type HCX-3 ,65-1 portable telephone can be a magnet for professional communication, such as mining , railways, etc., as well as floods, earthquakes and other natural disasters to provide emergency communications support.