Tired or replacing batteries? Viper's 5V DC 1000mA AC Adapter will get the necessary power to your electronic dartboard or Viper accessory and is an OEM replacement for damaged or missing power adapters. Compatible with the following Viper model numbers: 37-0000, 37-0108, 37-0116, 41-0401, 42-0000, 42-0001, 42-1017, 42-1020, 42-1021, 42-1022, 42-1023, 42-1034, 42-1035, 42-1036, 42-1055. Be sure to check your Viper dartboard or accessory to ensure that it has a plug-in port.