The product has two kinds of packages, one is display + host + sensor One is sensor Features: - Humanity design andEnglish voicenotification for distance of obstacle - 22mm 4 sensorsbackup parking system, double CPU and advanced chip for enhanced coverage and detection - Green, yellow and red 3 color,7 segment LED lights indicate obstacle distance - Detective range:30cm to 250cm , cm level display precision, accurately display obstacle distance - The appearance of sensor and body of vehicle is a perfect match, just like original binding accessories - Abnormal state sensor self-checking and prompt function, to avoid the back-draft collision caused by sensor damage - Anti-freeze and rain proof, easy to install with hole saw -Operating voltage : DC12V -Working current : 50 - 150mA -Operating temperature : -40 - 80 Deg.C -Ultrasonic frequency : 40KHz + / - 1KHz -2.5mlength cable, convenient to use Detection Mode: Radar Signal Detection Special features: Led Display Package weight: 0.489 kg Package Size(L x W x H): 17.00 x 12.00 x 5.00 cm / 6.69 x 4.72 x 1.97 inches Package Contents: 1 x Main Control Box, 1 x LED Display, 4 x Parking Sensor, 1x Power Cable, 1 x Hole Saw, 1 x English User Manual, 2 x Sticker The product has two kinds of packages, one is display + host + sensor One is sensor