electric parking bollards 3 seconds fall

{"cid":"91178329","title":"Road Traffic Safety Parking Hydraulic Road Blocker Automatic Rising Bollard","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/6f\/b5\/0ad47db40aa65bdf805dc31b145b-200x200-1.jpg","attrs":{"Price":"negotiable","Brand Name":"SECUERA","Model Number":"SERHB-02","Minimum Order Quantity":"1 pic","Delivery Time":"5-8 workdays","Certification":"CE,FCC,ROHS,ISO","Place of Origin":"China","Payment Terms":"L\/C, D\/A, D\/P, T\/T, Western Union, MoneyGram,Paypal","Supply Ability":"10 pic \/Month","Packaging Details":"Wooden Box","Warranty":"3 Years","Product Name":"rising hydraulic bollards","Life":"Over 10 years","Material":"304 Stainless Steel","Application":"Factory,School,Prison,Car Parking Station and so on","Feathers-1":"High security and anti-collision ability","Feathers-2":"Pneumatic air pump in control cabinet could procide large power safely for a long time","Feathers-3":"Electronic control, automatic rise\/fall","Feathers-4":"High system independence"}}

{"cid":"91108187","title":"Traffic Electric LED Boom Barrier Gate With Double Stage Driving Motor","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/49\/52\/563ecbd836c808108fbca275a813-200x200-1.jpg","attrs":{"Price":"negotiation","Brand Name":"WEJOIN","Model Number":"WJDZ102","Minimum Order Quantity":"1 unit","Delivery Time":"1-20 days","Place of Origin":"China","Certification":"CE,ISO,","Packaging Details":"Carton,wooden box","Payment Terms":"T\/T, Western Union","Supply Ability":"5000 units\/weeke","Trade Terms":"EXW,FOB,CIF","Color":"Red\/yellow\/grey\/etc","Product name":"Boom Barrier","Material":"Stainless Steel","Warranty":"1 Year","Boom length":"Max 6M (customized)"}}

{"cid":"91199448","title":"304 Stainless Steel Traffic Roadblocks","imgUrl":"https:\/\/img.silkroadsl.com\/nimg\/90\/36\/bf4bd8ae981c9fb918b13e42d88d-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"SONGRUI","Model Number":"QM6-219","Minimum Order Quantity":"50 SETS","Delivery Time":"5-8 WORK DAYS","Certification":"CE","Place of Origin":"China","Payment Terms":"T\/T","Product name":"stainless steel hydraulic rising bollards","Power supply":"110V\/220V\/(control voltage 36V)","Material":"304 stainless steel","Running speed":"2-4S ( ascending )","Control mode":"push button\/card reader\/remote control\/loop detector","travel height":"6mm\u00b12","Column diameter":"168mm\u00b12mm(OEM: 133mm,219mm, 273mm)"}}