Low profile design battery powered photoelectric smoke and CO combo alarm with Voice. Silence feature. Tamper resistant - Locks alarm to mounting bracket to prevent removal of battery and/or alarm. Low Profile Design - Sleek, contemporary design blends into any decor Exclusive Voice warning with location. A voice will tell you the programmed location of the unit and danger detected. Photoelectric smoke sensing technology Electrochemical CO sensing tecnology 10 Year end of life-10 year CO sensor and 10 year end of life. Provides audible notice when alarm needs to be replaced. (Note: Batteries do not last 10 years and are not tamper proof. Use PRC710VB for these features.) Silence feature Tamper Resistant-Locks alarm to mounting bracket to prevent removal of battery and/or alarm. Perfect for apartment, dormitory or hotel applications. 10-Years Limited Warranty Model: PRC700VB Alarm Dimensions: 5.7”Dia. x 1.28”H Weight: 7.6 oz Operating Voltage: 3V Battery Powered (2 AA Alkaline) Temperature Range: 40°F (4°C) to 100°F (38°C) Humidity Range: 10% to 95% relative humidity (RH) Audio Alarm: 85dB at 10 feet Test/Silence: Electronically simulates smoke and CO conditions, causing the unit to alarm. Press and hold test/silence button. Alarm Reset: Automatic when smoke clears Smoke Sensor: Photoelectric CO Sensor: Electrochemical Indicator Lights/Sounds: DC Power: Intermittent Green LED Local Alarm: Audio alarm and rapidly flashing Red LED Listing: Listed to UL217 and UL2034 Standards