Does it require power? What is the setup?

Yes. SkyBell requires full time power from a low voltage transformer and is compatible with secondary power from 10-36 VAC 10 VA. SkyBell also requires connection to a wired doorbell chime. Simply remove your old doorbell button and attach the two wires to SkyBell (assuming your power setup is correct and you have a wired doorbell chime). You will still hear the home doorbell chime in the house.

SkyBell is only designed to work with a low voltage transformer and wired doorbell (mechanical or digital with adapter). The primary power standard to the transformer can be 120/130 VAC or 220/230/240 VAC. The secondary power from the transformer to SkyBell must be 10-36 VAC 10VA.

WARNING: DO NOT CONNECT BOTH WIRES OF SKYBELL TO A TRANSFORMER, VDC POWER SUPPLY OR OTHER POWER SOURCE WITHOUT EITHER (A) WIRED DOORBELL CHIME OR (B) 10 OHM/10 WATT RESISTOR. IF YOU INSTALL SKYBELL WITHOUT A WIRED DOORBELL CHIME, YOU MUST USE A 10 OHM/10 WATT RESISTOR BETWEEN ONE CONNECTION TO SKYBELL FROM THE POWER SOURCE. FAILURE TO DO THIS CAN DAMAGE SKYBELL AND WILL AUTOMATICALLY VOID YOUR WARRANTY.