【For those who want to try karaoke or guitar performances on their smartphone】 To record karaoke or guitar performances on your smartphone, you need to connect a microphone to your smartphone. The necessary equipment for this is an audio interface. Among the many pieces of equipment available, the Rubix22 is the most suitable model for those who "want to connect to their smartphone or tablet without a computer and enjoy karaoke or guitar performances without complicated settings." With products from other companies, problems such as "hearing your own voice delayed" or "not being able to balance the volume with the music" often occur unless you use a dedicated app or make complex settings. However, with the Rubix22, you can solve these problems with just the knobs and switches on the unit. 【Features of this product】 Easy setup: No difficult knowledge is required. Simply connect it, and it will be recognized by your smartphone as a "high-quality external microphone." Zero sound delay stress: Because you monitor directly with the switches on the unit, you won't experience the discomfort of hearing your own voice delayed during recording. Recording error prevention lamp: A large lamp on the top of the unit lights up to let you know if the volume is too high, so even beginners can use it with confidence. 【★Limited benefits for purchasers】 1. Earphone adapter gift We will give you a gold-plated adapter that converts the large terminals for musical instruments to your usual "general earphones (3.5mm)". You can start right away with your existing equipment! 2. For those who are anxious about "setting up on a smartphone seems difficult..." To use this unit with an iPhone or iPad, etc., you need a little bit of know-how (how to get power and switch settings). After purchase, we will provide you with detailed "specific connection and setup procedures for enjoying karaoke recording and distribution without failure on your smartphone" via the transaction message. Beginners can start using it without hesitation as soon as it arrives, so please rest assured! * You will need to prepare a USB camera adapter, etc., separately to connect to your smartphone. 【Product condition】 Used only once: It is in like-new condition, having only been tested for operation. Fully tested for operation: Noise-free, very clear recording and playback are possible. Accessories: Main unit, USB cable, outer box, all instruction documents. Although it is a beautiful item that has been tested for operation, please understand that it is a used item. To prevent trouble, we cannot accept complaints or returns after the transaction is completed. Please understand this before making a purchase.