Product description: Color As shown Charging voltage: DC / 5V Charging time: 1-2 hours W orking voltage: DC / 3.7V Weight: approx 32g Size: 15 * 140 * 19.5mm Battery capacity: 400mAh Power: 2.9W Working current: 0-600mA Material: ABS Packing list: 1 * host, 1 * USB charging cable, 1 * manual USB electric whisk The hand-held electric milk frother can be recharged again and again with USB (batteries are not required). Built-in 1500mAH lithium battery. Charging: red light. Fully charged: blue light (4 hours). O verheating protection: It stops automatically after 3 minutes and restarts after a long press for 2 seconds. Easy to clean The manual milk frother is already an indispensable little helper in the kitchen. The removable agitator head is made of high quality stainless steel. The wand is made of food-safe ABS with a light weight and is nice and space-saving and easy to clean. This electric milk frother is very quiet, noise is as low as 15dB to give you and your families a peaceful morning. 3 Spead adjustable milk frother Spead: 19000rpm & 21000rpm & 23000rpm. Select the different speeds to achieve an ideal frothing effect, be sure to choose a large container. Note: Extended press to switch on and off (2 seconds). Short press to change the speed.