Roland's 3-channel mixer monitor, the MOBILE BA. Lightweight and compact, it can be battery-powered and used anywhere. It has been confirmed that all input terminals, MIC, LINE, PC/AUDIO, and the PHONES terminal, can be used. It works with both AA batteries and a Roland AC adapter. (Batteries and AC adapter are not included) There are scratches and stains. The noticeable ones are shown in the photos, but there may be some in areas not shown. Also, this product has screw holes on the bottom, allowing it to be mounted on 3/8 inch and 5/8 inch microphone stands, but a separately purchased adapter that converts 5/8 inch to 1/4 inch (camera tripod screw, etc.) is also included. (Use at your own risk) Please consider this product as a used item. - Brand: Roland - Model Name: Mobile BA - Color: White https://www.roland.com/jp/products/mobile_ba/ - Lightweight and compact stereo mobile amplifier for easy portability. - Up to 15 hours of continuous use with 6 AA alkaline batteries. - 3-channel specification that supports a variety of inputs such as microphones, instruments, PCs, and digital audio players. - Anti-feedback function that automatically detects and prevents howling. - Center cancel function convenient for vocal lessons and karaoke. - Equipped with a microphone echo function for comfortable vocals. - Comes with a dedicated strap for carrying.