4901-9820

The Simplex 4901-9820 is a TrueAlert non-addressable 24VDC electronic horn providing loud, harmonically rich audible notification for conventional fire alarm NAC circuits.
It features switch-selectable Free-Run or SmartSync operation modes, with diode-polarized input for reverse polarity supervised NACs and rugged red thermoplastic housing marked "FIRE".
Key Specifications
Feature
Specification
Voltage
16-33 VDC (nominal 24 VDC) 
Sound
2400-3700 Hz sweep, 120 Hz modulation; Temporal/March Time ​
Mounting
Single/double gang or 4″ square box; semi-flush/surface 
Current
Low current draw; selectable Free-Run or SmartSync modes ​
Dimensions
5-1/8″ H × 5″ W × 1-1/2″ D (130 × 127 × 38 mm) ​
Temperature
32–122°F (0–50°C); 10–93% RH ​