Features: Wireless Bluetooth Transmitter - To make wireless audio receiving and transmission. Optical fiber input for smart TV / X Box / PS4 needs. It can transmit the sound of TV / Computer / Notebook / TV Box / MP3 and so on to Bluetooth receiving devices like Bluetooth headset, Bluetooth speaker. No cable tangling problem, you can place the music receiver at anywhere you like. 2 in 1 - Support two Bluetooth receiving devices. High-quality sound, allows you to enjoy music, movies, dramas, and more. Compact and lightweight, easy to carry along with you wherever you go. Specification: Type: Bluetooth Audio Receiver Transmitter Material: ABS BT version: 4.1 Chip: For CSR BC8670 Frequency range: 2.402ghz - 2.480ghz Bluetooth protocol: For RX - A2DP AVRCP For TX - A2DP 2 in 1: Support (Connect 2 Bluetooth speakers or headphones while using the codec) Receiving method: Support 2 mobile phones Battery Type: Built-in 350mA rechargeable lithium battery Charging power supply: 110-240V AC adapter 5VDC 300mA Working temperature: 10 - 55° Working hours: For AUX - About 15 hours For SPDIF - About 12 hours Weight: 119g Size: Approx. 6 * 6 * 2cm / 2.4 * 2.4 * 0.8in Package Size: Approx. 19 * 10 * 3cm / 7.5 * 4 * 1.1in Package list: 1 * Wireless Bluetooth Audio Receiver Transmitter 1 * Fiber-optic Cable 1 * Audio Cable 1 * Charging Cable 1 * User Manual Note: 1. Please note that for single connections, the headset or speaker must also support ap-x, and if it is dual-connected, it would automatically switches to SBC codec Operation Steps: Selecting Mode: 1. Selects the transmit mode/receive mode through the toggle switch. Check if it is in "TX" mode before starting. Select AUX or SPDIF IN to connect to the TV/PC via the toggle switch. TV and computer must be set to external speakers mode. 2. After booting up, turn on the interface light, the Bluetooth pairing light flashes. Enter the Bluetooth search mode, and turn on the receiver / Bluetooth headset / Bluetooth speaker to enter the pairing state. The TX16 will automatically select the searched Bluetooth for connection pairing. When connection succeeded, you can start audio transmission. 3. When you need to connect a second device, press the multi-function button and the other LED will flash into search mode. The Bluetooth receiver will auto search for connection, and the light will illuminate when the connection is successful. 4. Press the multi-function key twice to reset and clear the reconnection. 5. When using for the second time, you only need to open the used products at the same time. Receiving Method: 1. Selects the transmit mode / receive mode through the toggle switch. Check if it is in "RX" mode before starting. Select AUX or SPDIF and connect the speakers through the toggle switch. 2. After booting, the interface lights up, red and blue flash alternately. Enter the pairing state, open Bluetooth, search for Bluetooth "TX16", click to connect. When the connection is successful, the light will be on. 3. When connecting another mobile phone, you only need to search for Bluetooth "TX16" directly on your mobile phone or tablet, and then click "Connect". 4. Press the multi-function key twice to reset and clear the reconnection. 5. When using for the second time, you just need to turn on your devices. 6. Automatically shuts down when the battery voltage is lower than 3.1V. 7. If there is no paired device, it will auto turn off after 5 minutes. 8. If you need to use it for a long time, you can connect it to the power supply DC5V and use it when charging. Please note that low battery voltage or charging can cause current noise. 1、Wireless Bluetooth Transmitter - To make wireless audio receiving and transmission. 2、Optical fiber input for smart TV / X Box / PS4 needs. 3、It can transmit the sound of TV / Computer / Notebook / TV Box / MP3 and so on to Bluetooth receiving devices like Bluetooth headset, Bluetooth speaker. 4、No cable tangling problem, you can place the music receiver at anywhere you like. 5、2 in 1 - Support two Bluetooth receiving devices.