Features: 2 in 1 wireless transmitter receiver, which can enable almost all sound devices in the home to have wireless function. Two newly upgraded modes with 3.5mm port, suitable for airplanes or televisions. Featuring double connectivity and supporting a working ranges of up to 33ft, provide ample space for you to relax and enjoy a musical feast. Built in double microphones for answering calls, equipped with noise reduction technology to suppress environmental noise and more accurately pick up sound. Plug and play, without driver required, easy to set up, and more convenient to use. Specifications: Product Name: Wireless BLE5.3 Multifunctional Transmitter Receiver Component: ABS Color: Black Size: approx. 14x50x41.3mm/0.55x1.96x1.62inch Version: BLE5.3 Charging voltages: 5V Charging current: 186mA Operating current: 20mA Shutdown current: 42μA Battery capacity: 240mAh Charging duration: about 2 hours Interfaces: 3.5mm Input/Output Package Includes: 1 Piece 2 in 1 Wireless Transmitter Receiver 1 Piece USB Charging Cable 1 Piece User Manual note: Other accessories demoed in the pictures is not included. Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.