The product adopts the module design of CSR8675 main chip, high-end integrated chip makes the product have one to two function, lossless sound quality, low delay, strong compatibility, low power consumption, etc.; the main chip has HD high-definition lossless decoder, playing music can reach CD level sound quality; the product is designed with hot switching function, which can be easily switched by the toggle switch. The product is mainly used for short-distance music wireless transmission. The Bluetooth transmission mode is suitable for Hi-Fi audio, for iPod, MP3 Player, TV, computer, CD... 3.5mm interface devices, audio streaming through the product's Bluetooth technology. Wirelessly transmit and then receive music through Bluetooth speakers or Bluetooth headsets. The Bluetooth receiving mode can be easily connected to Bluetooth devices of digital products such as laptops, TVs, mobile phones, PDAs, etc., to realize wireless transmission of music; connection to mobile phones can realize hands-free calling function. Features: Easily and smoothly transfer music from your smartphone to any audio device and enjoy high-definition (HD) audio. Hands-free calling with a built-in microphone, your non-Bluetooth car stereo and headphones will be able to receive Bluetooth signals, allowing you to talk hands-free and listen to music while driving. Casting aside from the shackles of traditional speaker cables, wireless listening to songs is more free to make the sound more realistic. Exquisite and compact appearance, PVC casing is durable and high temperature resistant. The MicroUSB charging port is designed to support plug-in and continuously play the built-in power supply isolation module, and the use is not hot. 10 meters of barrier-free audio transmission, free to enjoy the convenience of unlimited technology, the signal is widely stable. Specification: Main Chip: CSR8675 Bluetooth Specification: Bluetooth V5.0 Frequency Range: 2.4GHz-2.480GHz Bluetooth Receiving Mode Wireless Distance: About 10 M / 32.8ft Bluetooth Transmission Mode Wireless Distance: About 10 M / 32.8ft Receive Support Bluetooth Protocol: A2DP/HFP/HSP/AVRCP/APTX/APTX-LL/APTX-HD Launch Support Bluetooth Protocol: A2DP/APTX/APTX-LL/APTX-HD Output Audio Format: Stereo Analog Audio Input Audio Format: Stereo Analog Audio Receive Connectable Devices: 2 Launch Connectable Devices: 2 One-To-Two Connection Method: Short press the pairing button to trigger Working Voltage: DC 3.0-4.2 V Operating Current: Receive Mode ≤22mA; Transmit Mode ≤15mA Working Time: Receiving Mode: About 8H; Launch Mode: About 12H Shutdown Current: 0.02uA Built-In Lithium Battery: 180mAH Charging Voltage: DC+5V Charging Current: About 110mA Charging Time: About 2.0H Charging Protection Cut-Off Voltage: About 6.8V No Connection Shutdown Time: 10 Minutes Out Of Range Shutdown Time: Receive Mode: 20 Minutes; Launch Mode: 10 Minutes Call Function: Yes Voice Assistant: Connection status, long press the power button for about 1 second, hear the prompt tone Clear The Pairing List: Press and hold the pairing button for about 8 seconds until the red light is on for 2 times (clear without shutting down) Number Of Buttons: 4 External Interface: 3.5 Audio Plug, Fiber Interface, MK USB Plug Product Size: Approx. 4.7 x 4.7 x 1cm / 1.9 x 1.9 x 0.4in Packing List: 1 x Bluetooth Receiver 1 x USB Line 1 x Audio Cable 1 x Instruction Manual 1、Easily and smoothly transfer music from your smartphone to any audio device and enjoy high-definition (HD) audio. 2、Hands-free calling with a built-in microphone, your non-Bluetooth car stereo and headphones will be able to receive Bluetooth signals, allowing you to talk hands-free and listen to music while driving. 3、Casting aside from the shackles of traditional speaker cables, wireless listening to songs is more free to make the sound more realistic. 4、The MicroUSB charging port is designed to support plug-in and continuously play the built-in power supply isolation module, and the use is not hot. 5、10 meters of barrier-free audio transmission, free to enjoy the convenience of unlimited technology, the signal is widely stable.?