Ultrasonic ranging module HC - SR04
Product features:
1, typical work with voltage: 5 v.
2, ultra small static working current: less than 2 ma.
3, induction Angle: no greater than 15 degrees.
4, detection range: 2 cm - 400 cm
5, high precision: up to 0.3 cm.
6, blind zone (2 cm) very close.
7, completely modest let GH - 311 security module.
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