X500 BT HiFi Lossless Audio Receiver BT4.0 Chip External Omnidirectional Antenna Support AAC/MP3/SBC Decoding Gold US Plug Gold US Plug Features: BT4.0 version, stable and fast signal transmission, low latency, strong anti-interference ability. HiFi lossless sound quality, support AAC/MP3/SBC audio format decoding. Equipped with independent external omnidirectional antenna, the barrier-free transmission distance up to 20 meters. 3.5mm standard headphone jack output, compatible with 2RCA socket output for the amplifier. It makes ordinary speaker into a wireless BT speaker. Widely compatible with BT-enabled audio device, including mobile phone, tablet, laptop. Specification: Color: Gold BT protocol: BT4.0 BT profile: A2DP Audio decoder: AAC, SBC, MP3 Working channel: 79 Headphone frequency response: 20Hz-20KHz L/R channel isolation: -82dB Battery capacity: 350mAh Operating voltage: 3.7V Packing list: 1 * BT receiver 1 * RCA audio adapter cable 1 * Power adapter 1 * User manual