I purchased this about 3 years ago for a year-end party. The Bluetooth number is written on the instruction manual and the box. It is rechargeable and can be linked with a smartphone app. Karaoke microphone with Bluetooth-compatible colorful LED lights. - Product Name: Karaoke Microphone & HiFi Speaker - Bluetooth Function: Bluetooth compatible - LED Light: Equipped with colorful LED lights - Sound Quality Enhancement: Sound quality enhancement function available - microSD Card Support: microSD card can be used - USB Port: USB port equipped Thank you for looking.