* Suitable for A4 size to 15.4" of NB computer: Suitable for (30 to 38cm)(L) X (24 to 31cm)(w), simple and fast to adjust the size you need. Minimum 30(L) X 24cm(W) only, weight 0.27 kgs, easily on the go just pull down 2 foot put into with NB computer together, which made of non- hard quality material will never fray the skin of your NB Computer. * The air convection of heat dissipation cooling designed. The cooling stand design according to " hot up cold down " principle, soundless dispel the heat and get rid of the maintenance problem of the cooling fan and to save the considerable precious energy for it dont need any cooling fan. * Zero decibel is totally silent: Soundless dispel the heat and far away from the noise of the stand of fan. * Prolong the endurance of the battery: Most of the time the inside of NB computers cooling fan is static, so not only reduce power consumptive, but also prolong battery service time. * Ergonomics designed remove the neck and shoulder tension immediately. * Lifetime warranty: Three month or assurance for one year enough? If so then at less you need to buy 4 to 5 purchase of cooling stand for one NB computer? Add five years more for cooling fan of electricity, We not merely give you five years, what we gave to you is the assurance all your life. * The material accommodate with environmental protection of resource recovery: Made of recoverable A.B.S of high impact plastic, nonpoisonous, light-weight, firm and durable. 1pc/box,25pcs/ctn/1.7cu.ft.,n.w.:11.25kgs,g.w.:12.25kgs