Powered monitor with 30W output and a 6.5-inch speaker. - Model: CM-30 - Output: 30W - Speaker Size: 6.5-inch 2-way speaker - Power: AC 100V-50/60Hz Thank you for viewing. This is a compact amplifier, measuring 21cm x 24cm x 27cm. Although the manual and box are not included, it has only been used once. It's a great deal, as it sells for 28,600 yen on Amazon!