Is chalk dust harmful to the human body?
In the teaching process of Blackboard, teachers will inevitably get chalk dust on their hands. At the same time, particles floating in the air will also fall on the teacher’s hair, face and neck, irritating the skin membrane. If it is hydrolyzed by sweat in the summer to produce alkaline substances, it will irritate the skin and mucous membranes even more, because the environment of human skin is a weakly acidic environment, which destroys the basic living environment of the skin. Dust has an alkaline effect, and chalk dust makes the skin dry and rough, accompanied by itching, which makes the human body uncomfortable. In severe cases, it can cause acne, folliculitis, pyoderma, chapped skin, and massive hair loss, which affects and interferes with the normal work and life of teachers.
Jumei JMSX fully fits Smart Blackboard, 178-degree ultra-wide viewing angle, adopts the integrated design of blackboard and Smat Tablet, Smart Board For Classroom supports ordinary chalk, dust-free chalk and various pen writing, supports electronic whiteboard, free theme, color change , Built-in hundreds of useful tools such as page management, screenshots, pasting, magnifying glass, etc., not only blackboards, but also Multi-media Equipment, which can play teaching courseware, videos, pictures, animations and annotations.
Product Description
| Specification |
| Size | 75inch/1660(H)×934(V)mm |
| Windows | system | Windows 10 |
| CPU | Intel chipset 2nd generation and above Intel Core i3/i5/i7 |
| RAM | 4G DDR3 |
| Memory | 120G SSD |
| Windows OS | Windows 7/10 |
| Android | system | Android 8.0 |
| CPU | Cortex A53*4 1.5GHz |
| RAM | 2/3G |
| Memory | 8/16/32GB |
| Touch Info. | Touch Technology | Capacitive metal touch |
| Touch points | 10 / 20 points |
| Input way | Finger/capacitor pen |
| Touch life times | ＞100,000hrs（Typ) |
| Touch response speed | 8ms |
| Display Panel Info. | Display Type | LED |
| Resolution | 3840*2160 |
| Brightness | 350cd/㎡（Typ) |
| Ratio of display | 16:09 |
| Max. viewing angle | 178°(H)/178D°(V） |
| Contrast ratio | 1200:01:00 |
| Interface Info. | Support front power one-key switch |
| VGA signal input*1，Front TYBE-C*1，HDMI input*3 |
| Shared USB input*3, PC USB input*1 and Android USB input*1 |
| RJ45 input*1 and RJ45 output*1，RS232*1 |
| Front TOUCH USB-B output*1 and TOUCH USB-A output*1 |
| Other Info | Working voltage | 220v |
| Working temperature | 0~45℃ |
| Storage temperature | -25℃~60℃ |
| Working humidity | 5%-90% |
| Power of speaker | 8Ω15W*2 |
| Frame material | Alloy |
| Package | Product certificate, warranty card, laser pointer, microphone |
| product features |
| Five-finger screen | Humanized screen design, to meet the simultaneous operation of multiple people. |
| Fully fit anti-glare | diffuse light reflection treatment to prevent reflection, effectively protect eyesight. |
| Mass teaching resources | Covers early childhood, elementary school, junior high school, high school courseware. |
| Wireless screen transmission | Can screen mobile phone, ipad, computer screen in real time. |
| Dual system | Adopt windows and Android dual system integrated design. |
| Waterproof and explosion-proof | Adjustable agent ultra-narrow edge gap, splicing gap <0.2mm, high safety. |
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