OMNIHIL AC/DC Power Adapter Compatible with Polk Audio Omni S2 Wireless Speaker Cable PS Adapter Rating: World Wide 100V ~ 240V 50/60Hz High Quality PSU/Transformer / All products are tested to exceed/meet standard specification OVP, OCP, SCP Protection (OVP: Over Voltage output Protection. OCP: Over Current output Protection. SCP: Short Circuit output Protection) FREE RETURN SHIPPING / 5 YEAR FREE WARRANTY