JP/CT/ST 3500 Keypad & Main PCB set

Compatible with all JP/CT/ST 3500 phones Set includes main printed circuit board and keypad assembly All-in-one electronic dial pad and circuit board features automatic gain control, background noise filtering and DTMF standards Large oversized stainless steel bezel, marine quality sealed keypad-Waterproof to class IP55 Ambient Temperature: -40°C ~ + 60°C, -40 F ~ + 140 F Relative Humidity: ≤95% (at room temperature) Atmospheric Pressure: 80 ~ 110KPa Frequency Response: 250 ~ 3000 Hz Supply Voltage: 48 ~ 60V Feed Current: 25mA Call Transfer Index: SLR≤12 dB, RLR≤-1dB, STMR≥10dB Environmental Noise: ≤70dB Ringing level: ≥80dB Operates on C.O., analog lines or analog dialtone PABX/KSU stations