Switching left/right audio with a DPDT relay
The AZ850P2-5 is a two-coil bistable relay.

You apply a pulse between pin 1 and 5 to "set" the contacts, and between pin 10 and 6 to "reset" the contacts (5 volts, pin 1 and 10 positive). The contacts will stay in the last driven position - there is no need to apply power to hold the contacts in position.

When the relay is "reset" there are connections between pins 3 and 2, and between 8 and 9.  When "set", there are connections between 3 and 4, and between 8 and 7.