【230ft LONG RANGE & DUAL ANTENNAS】Utilizing Class 1 Bluetooth technology and dual antennas design, 1Mii B03 Bluetooth transmitter receiver can achieve a range of up to 230ft (70m) line-of-sight in open air and up to 80-110ft (25-35m) indoors. *NOTE: Operation range can be affected by Wi-Fi routers, Wireless TV adapters etc. and also depends on receiving device. 【NO LIP SYNC DELAY&DUAL STREAM】AptX Low Latency technology eliminate Bluetooth audio delay, Long Range adapter 1Mii B03 with 2 links, Pair with 2 pcs of Bluetooth headphones or 2 pcs of Bluetooth speakers & BOTH enjoy ultra fast, high fidelity audio. *NOTE: To achieve low latency, your receiving device must also support AptX Low Latency; Not support Low Latency under Dual Link. 【OPTICAL & AUXS】Supports both analog (RCA / 3.5mm AUX audio) and digital (optical) input and output! *NOTE: Please set your TV audio as PCM format as 1Mii B03 doesn't support Dolby / DTS format in optical mode.