When the charge cap is securely closed, the Moocall Calving Sensor is water resistant.
However, it is important to remember that much like your smart phone, this unit is an electronic device. It is vital that no water gets into the electronics of the device.
So while it will be alright in the rain, do NOT submerge the device underwater while cleaning it, etc.
We recommend using a damp cloth or a brush to clean your Moocall. You can remove the inside rubber and wash that as needed.