brand new and high quality Features: I2S output (BCK, LRCK, DATA), SPDIF output (DATA) Function keys: KEYCOM, for PLAY, VOL+, VOL-, PREV, NEXT, high level 3.3V is valid. The button functions are described as follows: PLAY: for play/pause (short press); re-pair (long press 2.5S); clear pairing list (long press 5S) VOL+: volume plus (short press, long press continuous volume plus) VOL-: Volume reduction (short press, long press continuous volume reduction) PREV: Previous song (short press) NEXT: next song (short press) KEYCOM: Button Common LED light: pairing status, double lights alternately flash; pairing is successful, single light flash. for Always in pairing when there is no connection, no standby. Control external amplifier mute foot MUTE (with sound: output high 3.3V, no sound: output low level). Support AAC, APTX-HD decoding. Specification: Output type: I2S output, SPDIF output Input voltage: 3.6-5V Dimensions: 3x3cm/1.18x1.18inch Color: As shown Quantity: 1 Pc Note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x CSR8675 Amplifier Module With Baseboard