USB Wifi dongle -bluetooth audio adapter transmitter Highlights generic brand bluetooth audio adapter transmitter Description: Features BT V4.1 for superior wireless performance (backward compatible with BT V3.0 and V2.1). Have memory for paired devices. The maximum transmission distance is more than 33 feet and can last 15 hours under full charge, which will take 2 hours with the USD charging cable. All-in-one solution for receiving and transmitting BT Mode RX: Easy pairing with BT-enabled smartphones, tablets, desktops and laptops. TX Mode: Easy pairing with BT headphones, earbuds, speakers and other BT-enabled audio systems. Plug and Play - no drivers or software required. specification: Material: ABS plastic BT version: BT 5.0+EDR: Battery capacity: 3.7v/300ma: Working hour: 8-12hours: Charging current: 120mA, 2h: Frequency response: 20hz-20khz: Frequency response: 20hz-20khz: Frequency response: 20hz-20khz Input: DC5v 500ma Sensitivity: 97-103db Size Chart: Size: approx. 42x42x13mm / 1.7x1.7x0.5inch Package includes: 1 piece Bluetooth audio adapter 1 piece audio cable 1 piece USB power cord 1 piece RCA wire Note: All dimensions are measured by hand, there may be some differences. small deviations. Color may vary slightly due to the color setting of each monitor. Thank you for understanding. Please enjoy your happy shopping time!