WN 7, Sonic Alert WIRELESS DOORBELL SIGNALER MODEL DRIPS SONIC ALERT'S LIMITED WARRANTY. The Wireless Doorbell Signaler Model DB100 is warranted against manufacturing | defects in materials and workmanship for two (2) year from the date of purchase. Within this period Sonic without charge for parts and tabor. Simply send the DB10O (postpaid) and a copy of your sales slip as proof of purchase io: Sonic Led Inc, 1050 E.