・This extremely portable and lightweight wireless audio transmitter and receiver is an ideal wireless audio solution device suitable for various situations and uses ・Transmitter mode:wirelessly transfer audio from a non-Bluetooth-compatible TV,home stereo system,or CD player to a Bluetooth-compatible headset or speaker ・Receiver mode:wirelessly transmit audio from Bluetooth-enabled mobile phones,tablets,or computers to wired stereo speakers,speakers,or headphones ・Just tap the switch to switch between transmitter and receiver modes. Use advanced Bluetooth-compatible technology and 3.5 mm audio cable (included) to easily connect ・Ultra-portable audio streaming capability:KN319 is only 44 mm (1.73 inches) wide and weighs only 18 grams (0.63 ounces),but it has powerful wireless audio streaming capabilities. Put this transmitter and receiver in your backpack or laptop bag and carry it with you,effortlessly ・Wide compatibility:using the 3.5mm cable (included) and 3.5mm to 2RCA cable,this receiver-transmitter adapter can be widely used in your computer,laptop,home stereo system,headset,smartphone,MP3 player,CD Player,etc. Specifications: ・Model:KN319 ・Technology:BT5.0,A2DP,AVRCP (only receiver mode) ・Operating range:up to 10m/33ft (barrier-free) ・Charging time:2 hours ・Continuous use time:6 hours (receiver mode)/5 hours (transmit mode) ・Battery type:200mAh lithium polymer battery ・Dimensions:44x44x12mm ・Weight:18g Package included: ・1xBluetooth-compatible 5.0 Audio Receiver/Transmitter Adapter ・1xMicro USB Power Cable ・1xRCA Cable ・1x3.5mm Aux Cable ・1xEnglish and Chinese Manual ・Other items not included