The phone is a useful medium of communication, but it can also be annoying. SMART KIT 1078 PROTECTION FROM MALICIOUS CALLS protects the user from unwanted phone calls by adjusting how many rings (or seconds) from the beginning of your call your device will sound 3 to 12 rings so that the pharmacist thinks you are missing from the house, only known and known friends to receive their phone calls. Power supply: 12 VDC. Consumption: 200 mA maximum.