Dell AD211 Bluetooth Portable Speaker - Manual (Page 13)

NFC (Near Field Communication) Pairing
Your speaker supports NFC-enabled devices for quick and convenient tap to pair
functionality.
1 Make sure the device to be paired supports NFC.
2 Power on your speaker.
3 Place your NFC-enabled device on top of the NFC logo on the speaker to
start pairing.
4 Accept the pairing on your NFC-enabled device.