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Description: Versatility: Using the included 3.5mm cable, this receiver transmitter adapter can be widely used in your computer, laptop, home stereo system, earphones, smart earphones, MP3 players, CD players, etc. This portable, lightweight wireless audio transmitter and receiver is an wireless audio solution suitable for various situations and purposes. Intelligent sleep wake-up and energy saving, 24-bit CRC check to resist interference, adaptive frequency hopping to reduce crosstalk. Transmitter mode: red LED light is on. Receiver mode: blue LED light is on. Specification: Item Name: Bluetooth Adapter Chip: 5.0 REALTEK RTL8671B Frequency Range: 2.400-2.480GHz Transmission rate: 100 (Mbps) Bluetooth standard: 5.0 Effective working radius: 10 (m) Interface: AUX output Color: Black Working frequency: 24 (MHz) Transmitter mode: red LED light is on Receiver mode: blue LED light is on Size: 1.69x0.82x0.43inch/43x21x11mm Package Includes: 1x Bluetooth transmitter receiver 1x 3.5 audio cable 1x User M