Universal Bluetooth Cassette Adapter For Aux Adapter For Smartphone Description: Bluetooth 50 allows you to use your car: transform your vehicle's cassette deck into a Bluetooth audio receiver to stream your favorite tunes through your car's speakers with support for two-channel stereo sound Stream for hours: 8 hours of continuous streaming from a single charge thanks to the built-in lithium-ion battery (USB charging cable included) Sleep mode: The receiver will automatically turn off in 5 minutes after disconnecting from any device Keep your old devices alive: add Bluetooth reception to old boom boxes and cassette deck Walkmans Plug and play: No driver or software needed Specification: Material: ABS Colour: black Product Size: About 10 x 6.4 x 0.9 cm / 3.9 x 2.5 x 0.35 inches Bluetooth Receiving / Connecting: Support Audio format: AAC, MP3, SBC, Stereo Bluetooth support: 5.0 + EDR Indicator light: blue, red Upload Distance: About 10m Battery capacity : 140mAh Charging current: 80mA Pairing Current: 8mA, Standby Current: 2mA, Music Play, Selecting Current is 30mA Operating voltage: 3.3-4.2V Charging input voltage: 4.5V-5.3V Output method : Bluetooth