How to power 16 channel relay

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i want buy 16 channel relay. according specs says needs 12v relay energize. noticed arduino uno using has max output of 5v. how power relays work?

here link..... http://www.amazon.com/sainsmart-16-ch-16-channel-relay-module/dp/b0057oc66u/ref=sr_1_1?ie=utf8&qid=1403101563&sr=8-1&keywords=16+channel+relay

that's not datasheet...

it looks has 16 opto isolators takes 16 signals plus ground the
microcontroller , 12v supply (several amps probably) power relays.

http://www.sainsmart.com/arduino-compatibles-1/relay/16-channel-relay/16-channel-12v-relay-module-for-pic-arm-avr-dsp-arduino-msp430-ttl-logic.html


Arduino Forum > Using Arduino > Motors, Mechanics, and Power (Moderator: fabioc84) > How to power 16 channel relay


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