This extremely portable, lightweight wireless audio transmitter & receiver is an ideal wireless audio solution for a wide range of situations and uses The ZF-169 is just 18mm across and weighs only 18g, but has got powerful wireless audio streaming capabilities. Slip this transmitter & receiver into your backpack or laptop bag and take it on the go without the slightest effort. Transmitter mode: wirelessly streams audio from your non-Bluetooth-compatible TV, home stereo system, or CD player to your Bluetooth-compatible headphones or speakers Receiver mode: wirelessly streams audio from your Bluetooth-enabled phone, tablet, or computer to your wired stereo, speakers, or headphones Widely compatible: with the 3.5mm cable (included), this Receiver Transmitter adapter can widely be used on your computer, laptop, home stereo system, headphone, smartphone, Mp3 player, CD player, etc. Mode switching: 1) If the device has been in a mode for a long time, it needs to be re-energized twice to switch to another mode; 2) If the device has just switched mode, you want to immediately switch to another mode, you only need to re-energize once. Pairing method: 1. RX mode: Pairing name: ZF-169, find it in the Bluetooth-compatible settings of the phone to pair. The blue light flashes during the pairing process and the blue light stops flashing after the pairing is successful. Connect the product to the audio device with a 3.5 audio cable; 2. TX mode: TX mode will automatically search for other Bluetooth-compatible receiving devices (such as Bluetooth-compatible headset, Bluetooth-compatible speaker, Bluetooth-compatible receiver, etc.), the red light flashes during pairing, and the red light stops flashing after pairing succeeds. Connect the product to a device such as a TV with a 3.5 audio cable/RCA audio cable