Features: brand new and high quality Microphone support: Handsfree calling when you are busy cleaning. Transmitter Mode: Wireless audio streams from your non bluetooth-compatible tv, home stereo system, or cd player to your bluetooth-compatible headphones or speakers. Receiver Mode: Wirelessly transmits audio from your bluetooth-compatible enabled phone, tablet or computer to your wired stereo, speakers or headphones. Switch between transmitter and receiver modes with the simple movement of a switch. Effortlessly connect using advanced bluetooth-compatible technology and 3.5mm audio cable (included). Super-portable audio-streaming power.The kn326 is just 41mm (1.61") in diameter and weighs just 17g (0.63oz), but it has powerful wireless audio streaming capabilities. Slip this transmitter & receiver into your backpack or laptop bag and take it with you. the-go effortlessly. Specifications: Interface: 3.5mm Transmission rate: 3Mbps Effective working radius: 10m Bluetooth-compatible standard: 5.0 Working frequency: 2.4MHz Technologies: BT5.0 Operation range: up to 10m / 33ft (without any blocking objects) Charging time: 2 hours Battery Type: Li-Polymer (200mah) Working time: RX: 6 hours; TX: 5 hours Size:41x41x10cm/1.61x1.61x0.39in One-key mode switching, blue light receiving, red light emitting Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1PC x Bluetooth-compatible 5.0 Receiver Transmitter