The Wireless Motion Detector with remote can be used as a portable alarm or be wall mounted. It can detect motion over an area of 30 feet by 110 degrees. The Wireless Motion Detector has a 45 second exit delay and a 10-15 second entry delay. This alarm is activated by the PIR sensor. The unit also uses magnetic sensors with 6 feet of wire to detect the opening of a protected door or window. The HS4340D also has a low battery indicator. The alarm is 120 dB; the chime is 85 dB. This alarm measures 4 1/2" x 3" x 1 3/4". The Wireless Motion Detector's power supply is 3 AA batteries which are not included. Also, an 7.5-15 volt adapter can be used (not included). The remote takes 2-1.5 volt batteries (SR44 or 357A) which are included. This alarm comes with 1 remote but additional Motion Alarm Remote Control can be purchased.