Features: Bluetooth 5.0 & Low Latency Supported Receiver. With the latest Bluetooth 5.0 chip, ELEGIANT BTI-036 Bluetooth receiver can effectively increase transmission rate and ensure transmission quality.  Built-in Battery & Built-in Mic. With built-in 600MA battery, ELEGIANT wireless audio adapter can provide more than 20 hours playing time after 3 hours of full charge. The built-in mic allows you to call / hanging-up safely while driving and activate Siri.  Hi-Fi Sound with 3D Audio. ELEGIANT AUX audio receiver features Bluetooth 5.0 chip to ensure high fidelity Bluetooth audio signal for music streaming to those speakers or home stereo systems that don't have the capability. And the 3D audio can be switched on or off by pressing the "3D" button on the Bluetooth audio receiver. The green LED will be on when switched to 3D audio.  Dual link for Two Devices & 164FT LONG RANGES. Connect 2 Bluetooth devices at the same time. Do not miss any important calls from your cell phone and enjoy the beautiful music from your cell phone or other Bluetooth devices, like laptop. With Class 1 Bluetooth technology, the 1Mii Bluetooth receiver can achieve a ranges of up to 164ft (50m) line-of-sight in open and up to 50-70ft (20-30m) indoors(without obstacles).  Easy Setup, easy to use. Easy plug, pair and play. This updated unit comes with a USB power adapter. Plug into computer speakers, home stereo systems or other speaker systems via the 3.5 mm or RCA cable, then pair with the Bluetooth audio devices such as smartphones or tablets. After that, you can enjoy the music. This product is a receiver only, NOT a transmitter.  Product Dimensions: 0.39 x 0.39 x 0.39 inches;  Item Weight: 2.57 ounces;     Package Included: 1 x Bluetooch Receiver;  1 x RCA Audio Cable;  1 x Charging Cable