We will send you Class a latest version now , and the sound quality will be much the old version New design bluetooth adapter work voltage : AC6.3V--AC18V 1.5A, DC8.0V--DC24V 1.5A, if the current exceeds 1.5A, the voltage above AV15V DC18V must be reduced to less than 1A. the higher the voltage, the smaller the current used, and the high voltage will burn the board . QCC5125 bluetooth 5.1 support : ,AAC, , -LL, -HD -HD+DSP, QCC5125 -HD + DSP is LDAC Material: ABS colour: as shown Package Contents: 1 x Bluetooth Audio Decoder 1 x Cable 1 x Antenna Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.