TROND 2-in-1 Bluetooth V5.0 Transmitter Receiver/Wireless 3.5mm Audio Adapter (AptX Low Latency for Both TX & RX, 2 Devices Simultaneously, for TV, iPod & CD-Player) Apt & apt Low Latency. Powered by premium CSR8670 chipset, TROND BT-DUO supports apt & apt Low Latency in both TX and RX mode. You can now watch movies while listening to wireless Audio in a synchronized fashion and without any noticeable Audio delay. In order to avoid the Audio lag, your Bluetooth headphones or speaker also need to support apt Low Latency. Please refer to your headphone or speaker Manufacturer and verify whether their devices could support apt Low Latency TROND BT-DUO can transmit stereo Audio wirelessly from your non-Bluetooth Audio sources such as TV, MP3, CD player, PC or book Reader to your Bluetooth-enabled headphones, speaker or receiver. This way, you can enjoy high quality music wirelessly or listen to late night shows without disturbing your loved ones while they sleep. Please order TROND td-bh01 over-ear BT V4.2 headphones to use with this transmitter and to avoid the lip-sync issues Due to apt Low Latency supported in the Rx mode, BT-DUO offers an economical solution by turning your old wired headphones or speakers into Bluetooth headphones or speakers with the feature of apt ll. Now, you can enjoyed-like Audio quality wirelessly on your home stereo or wired speaker. Please note that TROND BT-DUO doesn't have the built-in microphone, and hence doesnt support phone calls Dual stream & multi point. When used as a Bluetooth transmitter, TROND BT-DUO can be paired to two Bluetooth headphones or speakers, and streams audio to both of them simultaneously. Working as a Bluetooth receiver, it can still be paired to two of your smartphones or tablets, but the receiver can only receive the Audio from one of the two paired devices. Please note that the codec would be downgraded to SBC when pairing to two BT devices simultaneously What you get: TROND BT-DUO 3.5mm Bluetooth V5.0 transceiver with apt Low Latency, USB to Micro USB charging cable, 3.5mm Male to 3.5mm Male audio cable (50cm long), 3.5mm Female to RCA Male audio cable, welcome Guide, 18-month TROND warranty & 30-day MONEY back guarantee <span class="a-text-bold"><u>3.5mm Aux or Digital Optical?</u></span> In order to stream the audio from your TV, its very crucial to first identify whichi audio OUT port your TV could support (intead of any audio IN or video port). TROND BT-DUO can be connected via the 3.5mm cable. However, some LG or Samsung TVs have removed the 3.5mm aux jack, and only offer the digital optical OUT port. In this case, BT-DUO is not the right transmitter for you; please choose TROND BT-DUO II instead; <span class="a-text-bold"><u>AptX Low Latency Supported?</u></span> In order to avoid lip-sync issues, your BT headset or speaker also need to support the codec of aptX Low Latency. Please check with your device manufacturer to verify this. If not, the codec would be downgraded to aptX or even SBC, and you may experience the noticeable audio lag; <span class="a-text-bold"><u>Pair with your car Bluetooth (TX)?</u></span> Car Bluetooth may require entering a certain pin code in order to pair with your phone. Unlike phones, Bluetooth transmitters don&#039;t have any keypad to enter the pin code. Therefore, BT-DUO may not be able to stream the music from your iPod to your car stereo. Due to the rechargeable battery design, it cannot be powered on automatically after you start the car engine; <span class="a-text-bold"><u>Hands-Free Phone Calls?</u></span> BT-DUO doesn&#039;t have the built-in microphone. If connected to BT-DUO as a receiver, the in-line microphone of your wired headset will be disabled. Therefore it won&#039;t be able to support any phone calls. Disconnect your headphones from your phone or tablet; Switch the working mode to TX, instead of RX; Long press the MFB for 3 seconds to power it on; Quickly double tap the MFB to activate its pairing mode till the indicator blinks red &amp; blue alternately; Activate the pairing model of your headphones; Put those two close to each other, and wait for the pairing; if successful, its LED would turn solid blue. <span class="a-text-bold"><u>Noticeble audio lag?</u></span> Please check whether your device supports aptX Low Latency. Popular headphones, such as Bose QC35 or Beats Solo3, don&#039;t really support it, and you may experience the audio delay. <span class="a-text-bold"><u>Annoying static noise?</u></span> Please do not connect its 3.5mm aux jack and USB charging port to the same audio source, as it may easily cause &#034;ground loop noise&#034;. Please use a separate USB charger instead. <span class="a-text-bold"><u>Volume too low?</u></span> The TROND default setting is to retain 100% of audio volume it receives from the audio source. Please find out whether you could adjust the volume on your TV or Bluetooth headphones. <span class="a-text-bold"><u>Get frozen?</u></span> If BT-DUO gets stuck and all its buttons are not responding, please press &amp; hold the MFB, and meanwhile plug in an external USB charger to shut it down. After that, simply power it back on to use it properly.