Possible Clues:

• Bleeping device
• ''Grey's Anatomy'' clip-on
• Wireless device turned on before interval
• Signaller fermented grape
• Beeper, old-school
• A resident might carry one
• Cellphone forerunner
• Publicity about period radio device
• Pocketed by OAP, age-related communications device
• Device that bleeps to draw one's attention