1. It can be connected to speakers or headphones that support Bluetooth (A2DP protocol) (in TX state), or connected to a mobile phone or computer (in RX state). 2. supports for -029 (dual stream) from one to two functions (one -029 can connect two speakers or headphones at the same time and listen to music at the same time), -029 also supports multipoint connection. 3. It is compatible with APT-X -029, and other CODECs. 4. -029 supports fiber input and fiber output. 5. Supports A2DP AVRCP protocol. It can be connected with Bluetooth speakers or headphones that support the A2DP protocol to form a wireless audio transmission network for use on TV, CD, home theater, etc. They can also be connected to mobile phones / computers to . Specifications: Bluetooth version is: V 5.0 Transmit power: Class II, 10 meter range of use (actual range depends on the equipment connected to it) Frequency range: 2.402 ~ 2.480GHz Memory unit: 16M Flash memory unit Support Bluetooth Security keys are: 0000, 1111, 1234, 8888 Reception Status Usage Time: About 15 hours for AUX The use 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-ion polymer rechargeable battery Operating temperature: -10 ° C-55 ° C colour: black Material: metal + plastic size: 60x60x18.4mm Package Contents: 4 x bluetooth adapter 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.