It doesn't fit well in the shoulder, it doesn't massage but just vibrates, unfortunately... it also heats up too much.

Congratulations to the store, the seller, and Aliexpress for the excellent shoulder product that warms and massages; it works very well and significantly improves shoulder pain. An excellent product that you can buy; it arrived well-packaged and very quickly because the product is already in Brazil.

Terrible seller, sent the wrong product (I bought for the shoulder and they sent for the knee) and doesn't respond to messages. Only the seller's AI responds with generic things but doesn't solve the problem.

Electric Heating Shoulder Massage Heated Back Shoulder Brace Adjustable Heating Shoulder Massage Belt For Arm Muscle Relaxation

The delivery was fast as promised because the product was already in Brazil.
I am 1.80m tall and weigh 105kg, and my chest circumference is larger than described in the advertisement, but it fit with plenty of room to spare. It was only tight on the arm at first, but I was able to adjust it using another strap that comes with the product.
It heats up well, but there are times when pressing it with your hand feels like it might burn your skin.
The product's thermometer shows 72 degrees, but my thermometer shows up to 56 degrees.
The vibration is like a cell phone vibrating; you might think it has the same function as the shock machine used in physical therapy, but it's not the same principle; it only vibrates at two distinct points.
I only used it for heating for a maximum of 1 hour, and the battery still shows 45% charge. With vibration, the time decreases significantly.
I thought it was better than using a hot water bottle.
I used it for a week before the evaluation and I don't know if it helped my tendonitis much, but I think it enhances the effect of physical therapy.