this is ultrasonic radar built using HCSR04 UDM sensor and servo motor with arduino NANO board. its wireless radar that transmits distance and angle of detected object to remote receiver having TFT LCD monitor. it uses 434 MHz RF transreceiver modules to transmit data to considerable long range of 1.8 Km (1800 mtr). the receiver has radar dial display on 3.5" SPI TFT dispaly