Mier BW-DA610T0 Sensor Transmitter For The DA600 Wireless Series - Mier BW-DA610T0
These sensors detect vehicles as they pass within 15 feet, and then transmit a signal to the control panel. Sensors placed on the ground allow for a transmitting distance of about 500 feet. Placing it 3-4 feet high allows for a transmitting distance of 1000 feet. The DA-660 Long Range Antenna accessory boosts this range up to 1/2 mile! Sensors are enclosed in a durable and weatherproof enclosure. They are powered by just two AA batteries, which last about one year under normal usage and are easy to replace. A low-battery light indicates when it is time to change them.