The first picture is a product picture, the other pictures are sample displays Description: MEILAN is a professional outdoor sports electronic brand; We are committed to providing cool and intelligent outdoor electronic products for outdoor enthusiasts around the world, such as GPS riding code meter, speed treadmill and so on; Through our ecological hardware, APP and related accessories, our vast number of users can realize navigation, record and share the movement course wirelessly with APP. Meilan makes everyone\'s outdoor sports experience more interesting, smarter and more fun. We are one of the leaders in the field of code watches! This wireless speed & cadence sensor is dual-mode, because it has two receivers, it can measure speed and frequency at the same time. He uses physical measurement mode, so it can be used for indoor measurement and the measurement is very accurate. It can only be connected by Bluetooth. He can connect with APP, Samsung health, wahoo fitness, zwift, meilan, etc., and can also connect with code watch, sports watch, etc.  We are a genuine business, and our brand has its own factory, so the quality control is very good. If you have any questions, you can feed them back to our customer service staff, which will solve them for you as quickly as possible and better. Specifications: Specifications: Brand: MEILAN Products:Wireless Bike Speed Sensor &Cadence Sensor Color: black Power supply mode: CR2032 battery Power supply time: about 8 months Is there an APP: yes Is there a patent: yes Package Included: 1* speed & cadence sensor 2* receiver