I bought this about three years ago for a year-end party. The Bluetooth number is written on the instruction manual and the box. It's rechargeable and can be linked with a smartphone app. Bluetooth-enabled karaoke microphone with colorful LED lights. - Product Name: Karaoke Microphone & HiFi Speaker - Bluetooth Function: Bluetooth compatible - LED Light: Equipped with colorful LED lights - Sound Quality Enhancement: Features sound quality enhancement - microSD Card Compatible: microSD card can be used - USB Port: Equipped with a USB port Thank you for viewing.