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, multi-layer 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
Specifications
Ringing Level: 70dB(A)
Frequency deviation: ≤ 1.5%
Low base level:-9 ± 3 dB
Frequency group level: -7 ± 3 dB
Frequency combination of the high-low difference: 2 ± 1 dB
Total harmonic distortion: at least below the fundamental level low 20 dB
Call Transmission index: SLR ≤ 12, RLR ≤ -1, STMR ≥ 10
Output impedance: 600Ω
Electro-acoustic characteristics: sending loudness rating ≥ +2 dB ≤ +12 dB receiving loudness rating ≥ -8 dB ≤ -1 dB sidetone masking rating value ≥ +3dB ≥ +10 dB
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