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A good ideal telephone for use in wet or corrosive atmospheres 1.2 Key Performance Characteristics Housing: metal panels, strong anti-riot Handle: special ABS plastic, the overall structure, waterproof, dustproof, anti-crack, anti-knocking, tensile Handle headset, keyboard, buzzer, circuit boards, multilayer shell with all accessories waterproof, dustproof structure. Phone, good stability, anti-interference ability, in line with the national standard GB / T 15279-2002 Protection IP54 Housing having a grounding device and an internal circuit electrically completely isolated, with certain electromagnetic shielding effect Call clear voice, loud and clear voice, no feedback whistle Beautiful light machine 1.3 Technical Parameters Ringing level: 70dB ( A) Dual Tone Multi-Frequency ( DTMF) dialing: Frequency deviation: d 1.5% ; low base level: -9 ± 3dB; frequency group level: -7 ± 3dB frequency combination of the high-low difference: 2 ± 1dB; total harmonic distortion at least below the fundamental level low 20dB Call transmission index: SLR d 12, RLR d -1, STMR e 10, output impedance: 600© Electro-acoustic characteristics: Sending loudness rating e + 2 dB d + 12 dB receiving loudness rating e-8dB d-1dB sidetone masking rating value e + 3 dB e + 10 dB
