Feature: 1. Small design is more humanized, compact and sturdy. 2. Switch button, receiver mode: blue light is on, transmitter mode: red light is on. 3. Plug and play, no driver needed. Specification: 3 in 1, plug and play & receiver & transmitter, one click the button to switch receiver mode and transmitter mode. Plug and play, no driver needed. Features: Small design is more humanized, compact and sturdy. Switch button, receiver mode: blue light is on, transmitter mode: red light is on. Plug and play, no driver needed. Receiver mode: cordlessly streams audio from your BT-enabled phone, tablet, or PC to your wired stereo, speakers, or headphones. Transmitter mode: cordlessly streams audio from your non-BT TV, home stereo system, or CD player to your BT headphones or speakers. Specifications: BT Version: 5.0+EDR Operating Range: Maximum 10m/33ft (no obstacles) Transmitter Mode: Red light is on Receiver Mode: Blue light is on Mode Switch: One click the button Item Size: 45 * 20 * 9.5mm / 1.77 * 0.79 * 0.37in Package Weight: 15g / 0.53ounces Package Size: 50 * 30 * 10mm / 1.97 * 1.18 * 0.39in Packing List: 1 * BT5.0 Receiver Transmitter 1 * AUX Audio Cable 1 * User Manual Package List: 1 * BT5.0 Receiver Transmitter 1 * AUX Audio Cable 1 * User Manual