This is a 5V fixed-voltage MyVolts-branded power supply adaptor designed to meet exactly the power specification of your Viper GDL Laser Throw/Toe Line Marker Electronic Dartboard.
myVolts 5V adaptor for Hive Nano Hub, Nano 2 Hub, Nano 2 Hub V2, HUB317, HUB320
myVolts 5V adaptor for Elektron Overhub (V2, Mk II, White lettering)
myVolts 12V adaptor for Apogee Element, Quartet, Thunderbridge
myVolts 3V adaptor for Nintendo Gameboy Pocket, Gameboy Color
myVolts 15V adaptor for Native Instruments Maschine Studio, Maschine Studio Plat
myVolts 12V adaptor for Suzuki Omnichord, Qchord, OM100, OM150, OM200, OM300