With its small size and powerful wireless audio streaming function, the audio transmitter is portable in a backpack or laptop bag. It can wirelessly transmit the sound of TV and other audio sources to bluetooth-compatible headsets or bluetooth-compatible speakers. Made of plastic and metal material, the transmitter is durable. It is both a bluetooth-compatible audio receiver and a bluetooth-compatible audio transmitter, and can also be used as a bluetooth-compatible sound card. The length of the product is 3.9cm, the width is 2.5cm, and the thickness is 1.2cm. Lightweight and portable wireless audio transmitter is an excellent wireless audio solution for various situations and purposes. It is suitable for Android, for IOS system phones, and bluetooth-compatible speakers or headsets that support A2DP protocol. The transmitter can be widely used in your computer, laptop, home stereo system, headset, smart phone, Mp3 player, CD player, etc. Item Name: Audio Transmitter Material:Plastic,Metal Operating Range: up to 15m/50ft(without any Obstacles) Input/Output Connection: 3.5MM Stereo Interface Bluetooth Version: bluetooth-compatible V5.0 EDR Mode: Transmitter: Red LED Light is on; Receiver: Blue LED Light is on Power Supply Mode: USB 5V Power Supply Working Distance: 10M Mode Switching: Switch the Mode by Switching the TX/RX Switch Bluetooth Profile: A2DP / AVRCP Receiver Mode Only Size:3.9cmx2.5cmx1.2cm/1.54inx0.98inx0.47in Notes: Due to the light and screen setting difference, the product's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 X 3.5mm Audio Cable 1 X User Manual 1 X bluetooth-compatible Audio Transmitter