This Ultrasonic scanner is made by Devantech that has a longer range than the SRF04.
This great sonar ranger from Devantech offers an amazing wide range from 3cm to 6m. Unlike the SRF04, the SRF08 is interfaced using the IIC/I2C bus. There is an additional photocell sensor on the front of this detector.
900 MHz Rubber Duck Antenna - Male Type F
Mini module design ethernet switch circuit board for ethernet switch module 10/100mbps 5 port PCBA board OEM Motherboard.