2. Introduction to X1 2nd gen's Bluetooth function

A: 1. The X1 2nd gen's dual mode Bluetooth4.0 is based on F1C81 chips, supporting Bluetooth V2.1 or above(including 4.1, 4.2 etc.)

2. Bluetooth two-way transmission enables the X1 2nd gen to receive and transmit signal at same time. ( so you can use RM1 to control the playback while the palyer is connected to Bluetooth headphones or Bluetooth speakers.) 
But it cannot be connected to smart phones, X7 or other audio source via Bluetooth.

3. The default pairing code in X1 2nd gento pair with Bluetooth is "0000" or "8888".