The CHQ-WPK is a weatherproof back box and gasket set for various ESP audio/visual devices. The unit is compatible with:
CHQ-WS2 Wall Sounder
CHQ-WSB2 Wall Sounder Beacon
CHQ-CB Ceiling Beacon
CHQ-WB Wall Beacon
The unit (in combination with the above) increases the IP rating of the connected device to IP65 (for external use).