WH2A is NOT for use with WS1150, WH1150 and WH1170.
WH2A is ONLY for use with TESA Weather Pro model WS1151.
WH2A and WH2 outdoor sensors are not compatible and not exchangeable.
USE ONLY 1.5V LR type ALKALINE BATTERY.
DO NOT mix battery type, heavy-duty, rechargeable, lithium ETC.
Many problems are resolved with new, fresh batteries of the appropriate voltage.
Use fresh branded alkaline batteries with an expiration date of 5-6 years or more.
For more about batteries, please see Batteries Recommended for Weather Stations.
Place the sensor in a dry, shaded location to protect it from moisture build-up and direct sun exposure (may cause higher readings.) A proper location is on the north side of your house, about 46cm under the eaves—weather-resistant case and battery-powered.