Gsedaox - Multi Connect Bluetooth Receiver & Transmitter - 5 in 1 Transmitter and Receiver - Audio Adapter - Black 5-in-1 Powerful Bluetooth AdapterIt can work as Bluetooth Audio Transmitter, Bluetooth Audio Receiver, USB U-Disk Music Player, TF/Micro SD Card Music Player and Hands-free Car Kit. There is always a function that can do the work for you. (Note: Only one mode can work at the same time). Bluetooth Receiver & TransmitterBluetooth Receiver Mode (RX): Wirelessly receives audio from your phone/tablet/Smart TV and plays music on wired speakers/soundbar/amplifier/car aux system/boat via 3.5mm Jack and L/R RCA. BT Transmitter (TX) Mode: Connect it to non-Bluetooth device such as TV/PC/CD/MP3/MP4 via 3.5mm Jack or L/R RCA audio cable, and transmit audio wirelessly to Bluetooth headphones or speakers. (Note: Simultaneously connecting 2 Bluetooth devices is not supported.) Multiple Playback ModesSupports U disk/USB flash drive and TF/Micro SD card to play music, supports mp3/wav/wam/ape/flac audio formats, powerful audio decoding, allowing you to play your favorite high-quality music anywhere and anytime without internet connection. (Note: Does not support NTFS, please format the U disk or TF/Micro SD card to FAT32 or exFAT on your computer before using it with this adapter.) Large LCD ScreenGives you a clear overview of the current mode and working status: TX, RX, USB, TF. Shows the volume level when you adjust the volume knob. Shows the playtime when you play USB or Micro SD music. Makes your operation more intuitive and easier. Built-in BatteryYou can use it in any situation, even without an outlet. It can be fully charged in 1-2 hours and lasts for 6-8 hours, perfect for all-day listening or long road trips, you can also use it while charging. (Note: AC adapter is not included, charge it via your device's USB, car charger, or your own 5V USB AC adapter). Specifications: Size: 2.8 x 2.6 x 1.1 inches (73 x 67 x 30 mm); Housing Material: PC+ABS flame retardant; Battery Capacity: 3.7V/400mAh; Charging Time: 1-2 hours; Autonomy: 6-8 hours; Power Input Format: DC 5V-2.1A(MAX); Transmission Distance: About 10-20 meters without obstacles; Supported Protocols: RX: A2DP/AVRC, TX: A2DP; Operating Frequency Band: 2.402GHz - 2.480GHz; Power Level: Class II; Sensitivity: -85dBm