Hello,
This listing is for Brand new Ultrasonic sensor. 
Quantity - 2 pcs. 
Model # HC-SR04
Compatible with Arduino, Raspberry Pi and other micro-controllers. 

Message us for library support and bulk orders.
PCB designing, manufacturing and firmware development service availaable. LOWEST PRICE GUARANTEED.  

Most items delivers within 5 business days. 
Expedited shipping delivers in 3 days. 
Message us for same day delivery in NYC-Long island area. 
International shipping available. 
International buyers will be responsible for local custom duties.