Related Clues:

• Push button forerunner
• ''--- M for Murder''
• Firefighter's need
• Radio knob
• It's on the watch
• Contact, in a way
• Send an APB
• Ham's gear
• It can carry a tune
• Use a rotary phone
• Walkie-talkie
• Push button predecessor
• Former phone part
• Sound receiver
• Shortwave, e.g.