This item is a professional receiver. It is suitable for your car, home, or portable audio device with capability to wirelessly stream music from your , tablet or computer. Instantly upgrade your favorite speaker by connecting it with the 3.5mm audio cable. Features - Color: Black. - Size: 4.4x4.4x1.2cm - Material: Plastic. - This extremely portable, lightweight audio transmitter & receiver is an for a wide range of situations and uses - Transmitter mode：wirelessly streams audio from your home stereo system, or CD player to your headphones or speakers - Receiver mode：wirelessly streams audio from your phone, tablet, or computer to your stereo, speakers, or headphones. - between transmitter and receiver modes with the simple flick of a . Effortlessly connect using advanced technology and 3.5mm audio cable (included) - The KN321 is just 44mm (1.73”) across and weighs only (0.63oz), but has got powerful audio streaming capabilities. this transmitter & receiver into your backpack or laptop bag and take it on-the-go without the slightest effort. - With the included 3.5mm cable and 3.5mm to 2 cable, this Receiver Transmitter adapter can widely be used on your computer, laptop, home stereo system, headphone, , Mp3 player, CD player, etc. Specification - Model: KN321 - Technologies: .0, A2DP, AVRCP (receiver mode only) - Operation Range: Up to 10m / 33ft (without any objects) - Pairing name:KN321 - Charging Time: 2 hours - Battery Type: Li-Polymer (200mAh) : 44 × 44 × 12mm - Weight: Package list: 1x 5.0 Audio Transmitter/Receiver Adapter 1x Micro USB Power Cable 1x Cable 1x 3.5mm Aux Cable 1x User Manual