Features: brand new and high quality brand new and high quality Features BT V4.1 for superior wireless performance (backwards for BT V3.0, and V2.1). Have memory for the paired devices. Maximum transmission distance more than 33 feet, and it can last 15 hours on full charge, which will take 2 hours with the USD charging cable. All-in-one solution for BT receiving and transmitting RX mode : 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. Specifications: BT Version:BT 5.0+EDR: Battery Capacity:3.7v/300ma: Working Hour:8-12hours: Charging Current:120mA,2h: Frequency Response:20hz-20khz: Rate Input:DC5v 500ma Sensitivity:97-103db Host Size:approx 42x42x13mm/1.65x1.65x0.51in Host Weight: 20g Color:Black Note: Only the above package content, other products are not included. Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is1-2cm. Package includes: 1 x Wireless Audio Receiver Transmitter 1x 3.5mm Audio Cable 1x RCA Audio Cable 1x Charging Cable 1x Instruction