Note: Bluetooth adapter without volume control buttons. Specification: Item Type: BT Transmitter Receiver_x000D_Material: ABS_x000D_Battery: Li Ion Battery 402030 (Built in), Capacity: 300mAh_x000D_BT Version: BT5.0, EDR_x000D_Operating Time: 8 to 12 Hours_x000D_Frequency Response: 20hz-20khz_x000D_Rate Input: DC5V 500ma_x000D_Sensitivity: 1003db_x000D_RX Mode: Easy Pairing with BT Enabled Smartphones, Tablets, Desktops_x000D_and Laptops_x000D_TX Mode: Easy Pairing with BT Headphones, Earbuds, Speakers, and Other BT Enabled Sound Systems Features: 1TX Mode: Bluetooth transmitter plugs into a non Bluetooth device such as a TV, PC, MP3 player or electronic book reader via the AUX, RCA jack to transmit sound to a Bluetooth headset, speaker or receiver. 2RX Mode: 2 in 1 Bluetooth transmitter receiver, in RX mode, the Bluetooth receiver can connect to wired speakers, headphones, and receive sound from smartphones via Bluetooth. 3TX Mode Application: BT adapter wirelessly transmits stereo sound from your non Bluetooth sound source to Bluetooth enabled devices via TX mode, allowing you to enjoy premium music wirelessly without disturbing others. 4RX Mode Application: The Bluetooth AUX adapter allows you to enjoy CD like sound quality wirelessly on your home stereo or wired speakers by turning your old wired headphones or speakers into Bluetooth headphones or speakers. 5Long Battery Life: This Bluetooth transmitter receiver charges via USB cable and supports charging while working, with built in battery that supports the adapter for 8 to 12 hours of operation per full charge. PackageList: 1 x BT Transmitter Receiver 1 x RCA Cable 1 x 3.5mm Sound Cable 1 x USB Cable 1 x Instruction Manual