This is a used "BluDento BLT-HD" Bluetooth receiver. It allows you to play music in high quality via Bluetooth from Bluetooth-enabled devices such as smartphones and Amazon Echo Show, through a combo or stereo system. Bluetooth connection is easy, just like connecting headphones. It works without any problems. Specifications: Bluetooth Version: 5.1 Bluetooth Profiles: A2DP v1.3.1, EDR; LDAC, aptX HD, aptX Low Latency, aptX Classic, AAC, SBC audio codecs DAC: TI / Burr-Brown PCM5102A PCM interface: 32bit, 384kHz(Max) Supports 48kHz / 24bit LPCM audio data; DAC SN(Typ): 112dB Input: Bluetooth only Output: Stereo RCA, Digital TOSLINK Optical and SPDIF Coaxial Power: DC 5V USB type B #BluDento #BLT-HD #BluetoothReceiver #BluetoothReceiver