Features: Auditory Amplifiers 3.5 BT5.4 Auditory receiver transmitter 2 in 1 for wireless Auditory transmission, convenient and fast. Transmission signal distance: 0-15m; Fully compatible automatic matching; Button adjustment: for music switching, support for remote control, support for disk music playback music files Support noise reduction enhances sound for music lovers, TV gamers, car owners and other users who need wireless Auditory transmission. Home entertainment systems, car Auditory systems, televisions, computers and other devices, providing a freer and more convenient Auditory experience. Specifications: BT5.4 version: 5.4; Function: BT5.4 Auditory receiver transmitter 2 in 1; Transmission signal distance: 0-15m; Input connector: 3.5mm; Input: DC5V; Battery capacity: 1000mah Charging time: about 2 hours Charging: TypeC Playback: BT5.4/disk playback Operating： key switching/remote control Support independent Size:about 80x52x17mm/31.5x20.47x6.69in Component: plastic Package Includes: 1Set Wireless Auditory Transmitter Receiver note: Due to the problemsof lighting effect, there mightbe certain tolerances in product, please understand. Please allow 0-1cm error due to the measurment.