Product Description 1 aluminum foil antenna, covering the full back vision range of reversing parking, without any blind angle. 2 not need to drill, easy to install, put the antenna close to the inside of rear bumper bar, not affect the external appearance of car. 3 electromagnetic induction, according to detection range to alarm in three sections, user-friendly design. 4 LED display alarm + buzzer alarm, safe and reliable. 5 induction range within 2.7 m Note: The product has high sensitivity to sensor body and metal; for pure natural elements (such as rocks, trees), sensing capability is weaker. Color: Black Material: ABS Package size: about 18.5 x 14.5 x 4.5cm Host Size: about 58 x 35 x 17.3cm (2.3 x 1.34 x 0.7 inches) Sensing antenna length: about 2.3m Power cord length: about 1m Alarm speaker cable length: about 5 meters Parameter information: 1 operating voltage: DC 12V 2 with buzzer 3 alarm method: LED display and buzz 4 installation method: put sensor antenna close to bumper bar 5 applicable vehicles: universal Features: Compact, easy to install, easy to operate Note: LED does not display digital distance (meter). Package included 1 x Host 1 x Display + Buzzer Alarm 1 x Sensor antenna 1 x Bag accessories (2 x cable tie, 2 x magic tape, 1 x washer) 1 x English user manual In original package