FOUR 2-IN-1 Bluetooth Transmitter & Receiver Wireless Audio Adapter

Specifications: Bluetooth Version: 5.1 Bluetooth Distance: about 8m,(26.25feet) TX Working time: 10 hours RX Working time: 10 hours Standby time: about 3 month Charging time: 1.5 hours Power input: DC 5V/500mA Product Size: 66.1*38.2*13.6mm Audio Jack: 3.5mm Aux-in /Aux-out weight: 25g Material: Black ABS shell.