Open collector, Withstand voltage: 30 VDC, Control current: 30 mA (The open collector output is kept turned on till the conversation is finished after the call button was pressed.)
Internal Speaker
4 cm cone-type
Wiring
Two-core shielded cable
Transmission Range
0.5 km (546 yd)/Φ0.5 mm (AWG24) 0.8 km (874 yd)/Φ0.65 mm (AWG22) 1.3 km (1421 yd)/Φ0.9 mm (AWG19)
工作溫度
-10 ℃ to +50 ℃ (Temperature range not to freeze the speaker and switch)