40 Assembly of products for others in the nature of custom manufacturing of mobile phones, computers, earphones, earphone boxes, drones, audio covers, sound-transmitting nets, LEDs, electronic cigarettes, keyboard membranes, e-readers, virtual reality glasses, lenses, cameras, PCBA boards, smart watches, smart home devices in the nature of sweeping robots, connectors, chips, speakers, interactive touch screen terminals, radio equipment, minimally invasive surgical instruments, home monitoring equipment, hearing aids, rearview mirror actuators, pressure sensors, automotive central control panels and atmosphere lamp for others; providing information relating to material treatment; mold prevention treatment of furs, textiles, clothing, cloth and fabric; chemical treatment of textile; waterproofing of clothing; tanning in the nature of hide or leather processing