Includes One KA300RX Alarm Monitor Receiver and One KA300TX Alarm Transmitter Place the KA300TX Alarm Transmitter next to any smoke or carbon monoxide alarm in your home. Once the alarm sounds, the KA300TX will send a signal to the KA300RX Alarm Monitor Receiver which will alert you by strobe and loud alarm. Wirelessly monitor your existing smoke or carbon monoxide alarms Be alerted by strobe and loud alarm Install in minutes without tools or the cost of re-wiring the building Place the KA300TX Alarm Transmitter next to any smoke or carbon monoxide alarm in your home. Once the alarm sounds, the KA300TX will send a signal to the KA300RX Alarm Monitor Receiver which will alert you by strobe and loud alarm. This kit includes one KA300TX transmitter, which will monitor one alarm. Purchase up to two more transmitters for additional coverage KA300RX Features: 95dB alarm 177mCd strobe light 3 alarm channel LED colors: yellow, green and red Time-Condition signal process to prevent "nuisance" alarms 1 024 transmitter code combinations Up to 100 ft monitoring range AC adapter (included) Battery backup for audible alarm only (includes 9V battery) Each KA300RX receiver monitors up to 3 KA300TX transmitters Purchase multiple KA300RX units for use in dorms or hotels FCC, CSA approved UL listed KA300TX Features: Attach to a smoke or carbon monoxide alarm using included hook and loop fastener Uses CR2032 battery (included) Add up to three KA300TX per KA300RX (available for purchase separately) Feature Details Brand Krown Mfg part # KA300-SD Warranty One year Color White Weight (lbs) 1.42 Battery operated? Yes (batteries required) Batteries included? Yes Battery details (1) 9V Alkaline, (1) CR2032 Lithium Country of Manufacture China System Krown KA300 Alert Type(s) Vibration Flashing Light Loud Audible Low Vision / Deaf-Blind No Yes Yes No Transmitter / Receiver Transmitter(s) and Receiver(s) Alert Trigger(s) Baby Cry Carbon Monoxide Mobile / Smartphone Doorbell / door knock Motion Pager / SOS Phone / VP Smoke / Fire Sound Severe Weather No Yes No No No No No Yes No No Range (ft) 100 Expandable Yes Portable No Battery backup Yes USB charger No