Model Number: BYX-RJ11/ED24-#8220 Brand Name: Selong Key Specifications/Special Features: Used for telephone exchanger, various telephone lines faxmachine modem, ISDN, ADSL telephone terminal equipmentTo protect equipment from surge and over voltage damage whencircuit is induced lightning or high voltageSmall return circuit section and nice protectionperformanceLow residual voltage and quickly response timeWith over voltage and surge protection