Compare Quick view Battery-operated Smoke Alarm Unit, 9v, 85db Alarm, 3 7/8" Dia Kidde Log in for pricing Test button allows you to quickly check unit's circuitry, horn and battery status. Chirp-style low-battery indicator. Red power-status LED. Protective dust cover. Power Source(s): 9V Battery; Mounting: Ceiling; Wall. Log in for pricing Compare Quick view Qty in Cart: 0 Price: Log in for pricing Subtotal: