Product Name: Multi function Bluetooth adapterProduct version: StandardProduct Model: C41SBluetooth Version: Bluetooth V5.1Battery: Do not bulit-in battery (Powered by usb charging)Transmission Range: 10m ( free)Interface: 3.5mm AUX/COAXIAL/OPTICALWireless : V5.1 ,A2DP,,AVRCPUsing : Drive freeBasic Functions: Bluetooth receiver, Bluetooth transmitter, tfcard playback, key operation, digital fiber / coaxial /3.5mm input, led display.Support Devices: All kinds of speakers,desktop computer, laptop, TV, power amplifier,projectorColour:blackMaterial:plasticPackage Contents:1 x Bluetooth Audio Transmitter1 x Optical Filber Cable1 x Audio Cable1 x Charger Cable1 x English manualOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.