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Switch Plate Hygro Thermometer - fits any toggle-type switch. Displays room temperature and relative humidity. White. FEATURES AND BENEFITS Installs in minutes - no wiring necessary Simply replaces existing light switch wall plate For a healthier, safer room environment Ideal for use in any room Helps monitor energy costs and RH levels Runs on button cell battery - # LR44, LR1154, SR44, SR1154 Temperature Range - 20F to 120F Humidity Range - 15% to 95% RH 5-3/4"H X 3"W X 5/8" D (at thickest point)