5pcs HC-SR04 Ultrasonic Module Distance Measuring Transducer Sensor for Arduino

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5pcs HC-SR04 Ultrasonic Module Distance Measuring Transducer Sensor for Arduino
This module performance is stable, measure the distance accurately. performance  nearly the same as SRF05, SRF02  SRF05, SRF02 ultrasonic distance measuring module and other comparable. Module High precision, blind spots (2cm) super close.
Main technical parameters:
1: Voltage: DC 5V
2: Static current: less than 2mA
3: Electrical level output: 5V high
4: Electrical level  output: at the end of 0V
5: Induction angle: not more than 15 degrees
6: Detection distance: 2cm-450cm
7: High precision: 2mm
Wiring: VCC, trig (control side), echo (receiving end), GND
Module works principle:
(1) using IO trigger distance, the high signal to at least 10us;
(2) module automatically sends eight 40khz square wave, automatically detects whether a signal return;
(3) a signal back, through the IO output a high electrical  level, high electrical  level duration is: the ultrasound time from launch to return. Test distance = (time of the high electrical  level *  speed of sound (340M / S)) / 2;
Package Include:
5  x  New Ultrasonic Module HC-SR04 Distance Measuring Transducer Sensor for Arduino
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1.Items are shipped from china.we will send out within 1 bussiness day after receive the payment.
2.We only ship to ebay confirmed address. So before bidding,  please kindly verify your ebay address.
3.
Shipping to USA takes 8-18 days in normal condition by E-packet with tracking number.
Shipping to most other countries takes about 12-30 days via Economy Int'l Airmail.
Less than , without free tracking number,if you request tracking number,please send ebay message to us.
Over ,with tracking number free.The shipping time depends on your location and local postal service,as well as the weather condition along the shipping,sometimes may take longer,.please send ebay message to us if you didn't get your package.
4.Express shipping: Extra  -- will be charged for the first 500 grams for most countries. Send ebay message to us if  you need this service.
Terms of sale
1.If you are not satisfied when you receive your item, please return it within 30 days for a replacement or money back.   Please send ebay message to us before you return it.
2.If item is defective in 30 days, We will send you a replacement without extra charger, or offer refund after we receive the defective item.
3.If item is defective after 30 days, you can still send it back to us. We will send you a new one after receiving the defective item. But you have to pay the extra shipping fee.
About us
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So if you have any concerns,please don’t hesitate to send ebay message to us.