This is M Brown. M Black L Blue (light blue) is also available! [Instant purchase OK] Neck and shoulder warm-up goods ✨ Warm G Heat Neck. It warms up in about 10 seconds just by pressing the button, gently warming your neck. No batteries required, and it's a convenient item that can be reused just by boiling it in hot water after use ◎ ✔ Surface temperature: Approximately 50℃ ✔ Duration: Approximately 60 minutes ✔ M size (inner diameter approx. 10cm / outer diameter approx. 14cm) ✔ Color: Brown ✔ No batteries required, eco-friendly type Recommended for stiff neck and shoulder pain relief, cold protection, commuting to school, and outdoor activities. [Condition] New, unused I will ship it as is if possible, but there is a possibility that I will take it out of the package and send only the contents due to the thickness. In that case, I will include the instructions, so please rest assured!