Shenzhen RDT Digital Technology Co. Ltd. NICE18F User Manual

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Nice18f
2. Enable Bluetooth function of desired device, then search for 
   “Nice 18f" and click to pair.
3. Pairing is successful when the LED indicator shows blinking 
    blue light every 5 seconds. (Iphone/Ipad and some Android 
    products may display earphone battery status at Notification 
    Bar area.)