The track is pre-installed, as long as the track is connected in a straight line and the connector is fixed, it can be used. The difference between wifi and zigbee: wifi can be directly connected to the mobile phone, but the device will drop off when the network is not good; zigbee needs to connect to a phone through a gateway, but he can still execute commands even without a network. This link is the intelligent tuya curtain motor track system, single layer track contains 1 tuya Wifi/Zigbee mini motor + curtain track and mounting accessories + 1 single channel remote control, double layer track contains 2 tuya Wifi/Zigbee mini motor + curtain track and mounting accessories + 1 double channel remote control. The 1.2Nm motor belongs to the third generation motor, which is suitable for the motor within five meters, with about 40kg tension and a length of 225mm. The 2.0Nm motor is suitable for motors five meters away, with a tension of about 80kg and a length of 275mm. We will match the appropriate motor according to the size of the order. If the order size cannot be found, please consult customer service. The order process is as follows: A warm reminder before placing an order: zigbee needs gateway, which requires you to make additional purchases. Shipping 1 We make delivery by different ways, including air mail, DHL express, UPS express, Fedex express, TNT express and EMS express. Your order will be shipped out within promised time.As following is general deliver time of different shipping method Air mail(Air Parcel): About 7-30 days(But it takes longer time to reach Brazil, Russia, etc.) Express: About 2-10 business days (The Delivery time is for reference) 2.SERVICE TRANSIT TIME is provided by the carrier and excludes weekends and holidays. Transit times may vary,particularly during the holiday season. 3.We do not guarantee delivery time on all international shipments due to differences in customs clearing times in individual countries, which may affect how quickly your product is inspected. 4.The shipping cost does not include any import taxes, and buyers are responsible for customs duties. 5.If you have not received your shipment within 30 days from payment, please contact us. We will track the shipment and get back to you as soon as possible with a reply. Our goal is customer satisfaction! Tuya Wifi Motor Engine(Support Alice Google Alexa) With High Quality Customize Curtain Rod Tracks Complete Curtain Track Rail Product Set Curtain System For Home Office After-sale service: if the goods have any problem,we are willing to help,if the goods are dameged,we will ship new one. Please Kindly Note: 1. Warm Tips (1) This Smart Tuya Curtain Motor Track Rails System include 1pcs Tuya Wifi Motor+ Curtain Rail Track with install Accessories + 1pcs remote If you don't know how to customize the track, please take a picture of your windows and mark the size (accurate to centimeters). We will give our advise. (2) We will ship as Ceiling Mounted,straight track, Middle Open in default, If the buyer does not leave a message and does not communicate with the seller. (3) Here this link is for finished track rails with all accessories for Ceiling mounted. (4) Pls install slip parts assemble before operating track. Don't install motor to track untill you can operate track smoothly manuall. Or belt may be destroyed. (5) Subject to logistics rules, we will cut the track to a maximum of one meter and send it in sections. Buyers need to install it by themselves. The default logistics is international express delivery DHL, Fedex, UPS, EMS, Cainiao Heavy Parcel Line. (6) If you need U type or L type curtain track, pls also let us know, we can customize.Currently only 90°and 135° U-shapes are supported. (7) Usually, We will reduce customs declaration fees，track may produce some customs fee(depens on your local custom) and it is paid by your side. Keep your phone through after you order, it's very important! (8) Complimentary 1 wall support for every 1 meter 2. How to confirm the details and order the track? Please Measure and confirm the length of track as the picture show. Buyers need to consider the installation space of the track, need to leave 4CM installation space The length of track=A-4CM (4cm is installation space) 3. Confirm the Curtain track Open/Close Mode. ( Open from middle in default) 4. Confirm the curtain track Mounted Method 5. Curtain Rails Accessories Details 6.Our Customer Real Show Warranty 1. 1 year Manufacture's Warranty for defective items (excluding items damaged and/or misused after receipt) 2. All products has been checked, tested and packed in good condition before delivery.Defective items Must BE reported and returned to us within the warranty period(and the original package.).we will give you a return ID.Meanwhile Please tell us what the defect is,to eliminate improper use. 3. Buyer is responsible for Return shipping fee. Customer service We maintain high standards of excellence and strive for 100% customer satisfaction.We cherich every customer. Feedback is very important to us.We request that you contact us Immediately BEFORE you give us neutral or negative feedback,so that we can satisfactorily address your concerns.We will try our best to solve the problem. We really appreciate that you can give us 5 feedback star.Thanks for your support.