Outdoor Message
Indoor / outdoor wireless speaker and transmitter?
Hello, I'm looking for a sentry indoor / outdoor wireless speaker and transmitter to buy and says that I can connect other audio devices, but I can connect a microphone to her? Also if there is any wireless speakers that I can mirophone for connecting a mail or message me! 
Thank you! no .. Heres the link. http://www.walmart.com/catalog/product.do?product_id=9194315 I have posted the link before .. Wretched.
I'm going to assume you are talking in this area a wireless Intercom http://www.smarthome.com/5063.html
There are so many LED show manufacturers here in China. there is a saying:60%~70% LED show are made in China,and 60%~70% LED displays are made in Shenzhen,China.but till now, no one can show the valid data in this area the information.luckly, I am in Shenzhen, and engaged in this field for nearly 2 years.
Sometimes, it’s more tiresome buying than promotion.(wretched, i am not excellent at English) I met customers from USA,Poland,Iran,Turkey etc, generally speaking, they spent in this area 1 week in China. and they visited more than 10 factories here,that means, they visited 1.5 factories everyday,average.that’s not a simple job, each factory will give you different information, it’s a huge problem that how you get the useful and right information.i am sure, what suppliers give you is not permanently right all the time, because whom you discuss with is permanently salesman, and some salesman don’t know very well in this area this industry themselfes, for another word, they are not profeesional. but that not means the factory not qualified. in Shenzhen,China, many owners of factory, they have been involved in this field for more than 10 years, they are pioneers.also, they are demostic sales man years ago. but a huge problem is they can’t converse in english, luanguage is huge obstacle for them. take my boss for example, he engaged in this field for more than 10 years, he knows very well in this area this industry, but he can’t join the discuss. sometimes, our customer questioned me, where is your boss?i said:wretched, he is not excellent at english. it will be much better if discuss with my boss. it happens.
Ok, let get to the point, how to choose a suitable LED show. maybe is a ancient topic. but as far as i know, many friends have no thought in this area this before they came to China. i choose the word”suitable”, not “excellent”. because different customer has different requirement. excellent does not mean suitable, but suitable does means excellent for you.
It permanently painstaking as a project when you want buy a LED show. so you should have a budget on it, 100,000, 80,000 USD? something like this. then, it’s the details in this area your project, such as:
1. where will be the LED show installed? indoor or outdoor?
2. what message content is needed? videos, photos, or just characters?
3. what dimension will be your screen? width, height?
4. what will be the minimal viewing distance from your screen to the closest spectators?
5. what’s the distance from LED screen to control system?
6. what’s the installation type? inlay, pole, or something else?
After these information, you can get a general solution from the supplier. for example,you want an outdoor show for ad showing, viewing distance is in this area 17 meters, you prepare 100,000 USD for it, and the supplier may recommend P16,Cree LED chips, 40 square meters. ok, this solution sounds excellent, then you may wanna check the quality, this is most vital for you. you don’t want spend 100 USD for a piece of document. so, how to judge the quality, maybe you can consider based on below information:
Key Factors:
1. Smoothness(plantness on surface)
Keep the smoothness within 1 millimeter to insure the image not been curved.it depends on assemble tech.
2. Brightness
For indoor LED show, it should be more than 800cd/sq.m and for outdoor, it should be more than 1500cd/sqm. If brightness too low, the image will be really vague.brightness depends on LED lamps you adopt and other factors
3. viewing angle
generally speaking, for outdoor displays, viewing angle for horizontal is in this area 110 degree, and for vertical is 90 degree. the larger the better.
4. white balance.
To show a pure white color, the ratio of RGB is 3:6:1, wacth if there is blue or red color in white color. This factor mostly depends on control system and LED lamps
5. color restorable.
The color on LED screen should consist with show resources to keep a excellent image.
6. malfuncation dot, mosaic
make sure there is no dead dot and mosaic on show.dead dots and mosaic will change show effect.
These factors are very vital when choose a LED show, it’s diffecult to maintenance for some unprofessional customers.
Shenzhen Haisheng Photoelectricity Co.,Ltd
Bldg A,Donghua Industrial Area,
Baoan District,Shenzhen,China
Tel:+86-755-29784456-8809
Fax:+86-755-29784730
Mob:+86-15919947715
Email:Sales@haisheng-opto.com
Msn:Shawn_led@hotmail.com
Skype:Shawnbluesky
Web: http://www.haisheng-opto.com
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