Description: 2 in 1 Receiver Transmitter:Turn to Switcher to the "RX" or "TX" position, the device will work in to Wireless Receiver/Transmitter . 5.0 version, The signal is more stable and the sound quality is more pleasant Plug and Play: transmission : connection, TV, laptop, desktop computer, projector, radio.Wireless connection, headset, speaker. receive : devices, mobile phones, laptops, desktop computers, MP3, game consoles. Audio equipment, speakersAUX or RCA, home speakers, amplifiers, headphones, car speakers How to Use Connect the device with a 3.5mm interface, press and hold the power switch for 3 seconds. When using the receiving , search for B-10S and connect. When using the transmit , turn on the headset or speaker, and it will automatically pair. Note that when switching modes, turn off the device first Long Working Time: Audio Devices built-in rechargeable lithium battery , the working time will last for about 5-8 hours while just need to charge it for 2 hours Need to Know: receiver built-in AEC echo cancellation and ANC noise cancellation circuit, compatible, Android, IOS system mobile phone and PAD, and all audio devices. Support AUX Specification: version: 5.0 Size: 135x80x20MM Working time: 5-8 hours Charging time: 2 hours Output: 3.5MM audio output Package Includes: 1 x V5.0 Adaptor receiver and transmitter 1 x 0.5M USB to micro USB charging cable 1 x 3.5mm 0.5M AUX Audio Cable 1 x User Note: B-10S Audio Devices doesn't have the built-in microphone. If connected to B-10S as a receiver, the built-in microphone of your headset will be disabled. Therefore it won't be able to support any phone calls.