This low cost add-on to the telephone system allows for multiple ringing extensions without loading the lone. FK304 is designed for use in shops, home, Offices, work-shed and noisy, busy environments.
Power supply: 6-9 V DC
Current: 36mA max. @ 9V DC
Tone adjustment via Trimmer Potentiometer
PCB Dimensions: 54mm X 48mm X 15mm (2.13 X 1.87 X 0.6 in.)