1、After digital products such as phones and computers are connected to the device, you can enjoy bluetooth music or hands‑free calls. 2、With AUX audio interface, you can upgrade the car or home audio to a Bluetooth audio, listen to music wirelessly, and enjoy free music. 3、Hands‑free calling, one‑click answering calls, back clip design, simple connection, without any cumbersome driving and downloading APP. 4、The product has a low‑latency mode, which can be switched freely to meet your gaming needs. 5、3.5MM audio output interface design, flexible and more versatile, small, lightweight and portable. Item Type: Portable Audio Receiver Material: ABS Color: As Picture Shown Weight: Approx. 68.0g/2.4oz Bluetooth Version: Bluetooth V5.1 Support Protocol: A2DP, AVRCP, HFP, HSP Working Frequency: 2.402GHz -2.480GHz Power Level: Class II Receiving Sensitivity: -90dB at 0.1% BER Working Current: Normal Mode: About 16MA Low Latency Mode: About 18MA Built-in Battery: 110MAH Charging Current: about 100MA Charging Time: About 1.5 hours Low Delay Mode: LL button can switch cyclically, in LL mode, the indicator green light is on Life Time: >6H Bluetooth Distance:> 10M (open place) Charging Method: Micro USB 5V Output Connection Mode: 3.5MM stereo interface Compatible for Android/IOS system mobile phones/PAD, and other audio equipment with AUX input function Hoe to use: 1. Turn on/off (the interval between on/off should be greater than 3 seconds) Press and hold the multi-function button for 3 seconds to turn on/off. 2. Automatic shutdown function The device is in an unconnected state, and automatically shuts down after 10 minutes, and wakes up after restarting. 3. Clear the pairing function In the shutdown state, press and hold the multi-function button for 6S, and the green light of "LL" flashes to clear the paired device information. 4. Low-latency mode During the connection, if you need to enter the low-latency mode, please click the "LL" button, the green light below the button will light up, and the product will enter the low-latency mode. 5. Music playback During music playback, short press the multi-function button to achieve pause and playback functions. Short press the "+" button to realize the volume increase function. Short press the "-" button to realize the volume reduction function. Press and hold the "+" button to switch to the previous song and press the "-" button to switch to the later song 6. When an incoming call occurs in the call function, short press the multi-function button to answer the call. During a call, short press the multi-function button to hanging up the call. And press the multi-function button for 1 second to reject the call. Note: Please make sure that the call is as close as possible to the MIC port to ensure the quality of the call. Pairing steps: A. Press and hold the multi-function button on the device for 3 seconds, the indicator light is on, and the device is turned on B. The blue indicator light below the device flashes quickly, and the device enters the Bluetooth pairing state. D. Turn on the Bluetooth function of the mobile phone, click Search Bluetooth device, and then select and connect the device "BT-B51 in the Bluetooth list. E. After the connection is successful, the blue indicator light below the device will flash slowly. 1 x Portable Audio Receiver 1 x Power Supply Cable 1 x Power Cable 1 x Earphone 1 x Manual