Jakcom&Acirc; R3 Smart Ring Consumer Electronics Mobile Phone Accessories 2016 Trending Products Android Smart Watch Phones Smartwatch (Black, 8) Q: My ring isn't recognized right away. What can I do? Answer: Try to roll your ring over the sweet spot of your device. Q: Whats a sweet spot? Answer: The sweet spot is the place on your device where the ring is read most easily. Often this is right over the NFC antennae. Q: What other hardware devices can interact with the ring? Answer: Raspberry Pi and Arduino both have NFC modules available that work great with the ring. Q: Can I use my ring for contactless payments? Answer: If you create your own method then yes but we don't provide a mechanism to do this.NOTICE: CAN NOT CONNECT WITH IPHONE, AND THE BATTERY OF NFC SMART PHONE MUST BE ORIGINAL. No Need Battery Charging