I. Could you provide SDK if I have my own APP?Yes, we are the developer of APP and Device, we could provide SDK or BLE document.2. Can I customized LOGO?Yes you can. There are three points customized logo.1).The brand logo displayed when power on wristband. Pls nate your requests.2). APP icon3)APP frist page logo4).Package (Logo on gift box)5). Screen printing on strap of Fitpolo.3. Can I customized functions?Yes, you can, we have professiona! R&D team to support best service, and give you bestsuggestions.4. How about the quality of your products?Our raw materials are purchased from qualified suppliers. And we have a strong quality controlteam to guarantee our products quality5. How long is your products quality warranty?We provide one year factory quality warranty.6. When can you ship out my order after my payment?'Normally samples order, about 2-4 days, mass order 2-3 weeks.7. Can I visit your factory and company office?Sure, Any time!