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A new operating mode (tying the mode pin to ground) allows the SRF05 to use a single pin for both trigger and echo, thereby saving valuable pins on your controller. When the mode pin is left unconnected, the SRF05 operates with separate trigger and echo pins, like the SRF04.Voltage: 5V only Required Low Current: 4 mA Typical! Frequency: 40 KHz Maximum Range: 4 meters (~13 ft.) Minimum Range: 1 cm (<1/2") Modes: Single pin for trig/echo or 2 Pin SRF04 compatible. Input Trigger: 10 uSec min. TTL level pulse Echo Pulse: Positive TTL level signal, width proportional to range Size: 1.69 x 0.79 x 0.67 in.43 x 20 x 17 mm