1. It can be connected to speakers or headphones support Bluetooth (A2DP protocol) (in TX state), or connected to a mobile phone or computer (in state). 2. supports for BTI-029 (dual ) from one to two functions (one BTI-029 can two speakers or headphones at the time and listen to music at the time), BTI-029 also supports multipoint connection. 3. It is with -X BTI-029, and other CODECs. 4. BTI-029 supports fiber input and fiber output. 5. Supports A2DP AVRCP protocol. It can be connected with Bluetooth speakers or headphones support the A2DP protocol to form a wireless audio transmission network for on TV, CD, home theater, etc. They can also be connected to mobile phones / computers to play music. Specifications: Bluetooth version is: V 5.0 Transmit : Class II, 10 meter range of (actual range depends on the equipment connected to it) Frequency range: 2.402 ~ 2.480GHz Memory unit: 16M Flash memory unit Support Bluetooth Security are: 0000, 1111, 1234, 8888 Status Usage Time: About 15 hours for AUX The time of the launch state: about 15 hours for AUX Receive Status Usage Time: About 12 hours for SPDIF Launch Status Usage Time: About 12 hours for SPDIF Charging time: about 2 hours Charging requirements: 5V DC greater or equal to 300MA Battery: 350mAh Li- polymer rechargeable battery Operating temperature: -10 C-55 C colour: black Material: metal + plastic size: 60x60x18.4mm Package Contents: 1 x bluetooth adapter Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.