Features: This extremely lightweight wireless transmitters & receiver is a wireless solution for wide situations and use; Transmitters Modes:Wirelessly sound from your not Bluetooth-compatible TV, home system, player to your Bluetooth-compatible headphones,speaker; Receiver modes: wirelessly sound device from your Bluetooth-compatible phone, tablets, computer to your wire speaker, headphones; Switches between transmitters and receiver modes with the simple flicks of switches. Easily connect usings advanced Bluetooth-compatible technology and 3.5mm cable (included). Small Streaming Power:The adapters is just 44mm (1.73in) across and weighs only 18g (0.63oz), but have get powerful wireless streaming capabilities. Slip this transmitters & receiver into your bag and take it on travelling without the slightest effort. Broad Compatibility: With the included 3.5mm cable and 3.5mm to 2RCA cable, this Receiver Transmitters adapters can widely be used on your computer, laptops, home system, headphone, phone, player, etc. Specifications: Model: KN321 Technologies: Bluetooth-compatible5.0, A2DP, AVRCP (receiver modes only) Operation Range: Up to 10m/33ft (without any blocking objects) Charging Time: 2hour Continuous Use Time: 4hours (Receiver Modes)/3 hours (Transmitters Modes) Battery Capacity:200mAh Dimensions:Approx.44×44×12mm Package Includes: 1xBluetooth-compatible Transmitters/Receiver Adapters 1xMicro USB Power Cable 1xRCA Cable 1x3.5mm Cable 1xUser Manual note: Please allow 1-2cm errors due to manual measurement,please make sure that you donot mind befores you order. Due to the differences between different monitors, the picture may not reflect the actual item color.