Vktech HiFi Bluetooth 4.0 Lossless Audio Receiver X400 Wireless Music Link Gold Wireless Bluetooth hi-fi sound quality perfect experience 2.4G dedicated omnidirectional antenna design, wireless transmission range up to 65 feet A wide range of compatibility, applicable to a variety of audio equipment with bluetooth stereo audio functionality Metal housing design both aesthetic and durability Efficient built-in lithium battery, long battery life up to 20 hours