10 PCS NC NO Signal Options Security Alarm Accessories Button Panic Button Fire Alarm Emergency Switch

Impedance: 6/8/12 Ohm
Voice coil diameter: 25.4 mm ??
Rated voltage: 12VDC/24VDC–Only 15W
Operating voltage range :9 ~ 16 VDC/20 ~ 25VDC
Power: 15 w / 20 w / 25 w
Sound pressure/db :105/108/110(At Rated Voltage At 1M)
Maximum current: 700/1000/1200ma
Audio: Warble/ 1-tone / 6-tone
Working temperature: – 20 ~ 60 ??