Stops voltage spikes with the potential to do costly damage. Uses metal oxide varistors to suppress any voltage above 26V on pins 2,3 & 7.

Highly effective Gas Arrester type 2 pin, voltage spike protection inline Male to Female RJ12 6P2C Modems, phones, & fax machines.

SURGE PROTECTOR FOR MAINS AND TELEPHONE/MODEM
As above with the addition of a modem/phone line protection Slimline

Ferrite cores, split inside a plastic case that snaps closed over power and data cables. Suppress noise from / to many sources. eg.