1
больше

§¬§à§ß§ã§å§Ý§î§ä§Ñ§è§Ú§à§ß§ß§Ñ§ñ §Ô§à§â§ñ§é§Ñ§ñ §Ý§Ú§ß§Ú§ñ£º+86  191-4770-0036

²úÆ·
  • ²úÆ·
Поиск

§±§â§Ú§Ó§Ö§ä, §Õ§à§Ò§â§à §á§à§Ø§Ñ§Ý§à§Ó§Ñ§ä§î §Ó §ã§Ú§ã§ä§Ö§Þ§å HK JDW!

§¬§Ú§ä§Ñ§Û§ã§Ü§Ú§Û £ü§¡§ß§Ô§Ý§Ú§Û§ã§Ü§Ú§Û

§±§â§à§Õ§å§Ü§ä§í
Подробное описание

ISO7842DWR

Перейти к телефону, чтобы купить
§¸§Ö§ß§Ñ
$14.32
Суммарные продажи0Совокупная оценка0
§¢§â§Ö§ß§Õ
§¬§à§Õ §Õ§Ñ§ä§í
  1. 20+
§°§á§Ú§ã§Ñ§ß§Ú§Ö
Количество покупок
- +
коллекция
§¥§Ñ§ß§ß§í§Ö PDF
§°§á§Ú§ã§Ñ§ß§Ú§Ö

ISO7842DWR: §á§Ö§â§Ö§à§ã§Þ§í§ã§Ý§Ö§ß§Ú§Ö §ï§Ý§Ö§Ü§ä§â§Ú§é§Ö§ã§Ü§à§Û §Ú§Ù§à§Ý§ñ§è§Ú§Ú §Õ§Ý§ñ §á§à§Ó§í§ê§Ö§ß§Ú§ñ §Ò§Ö§Ù§à§á§Ñ§ã§ß§à§ã§ä§Ú §Ú §á§â§à§Ú§Ù§Ó§à§Õ§Ú§ä§Ö§Ý§î§ß§à§ã§ä§Ú


§°§Ò§ë§Ñ§ñ §Ú§ß§æ§à§â§Þ§Ñ§è§Ú§ñ:

ISO7842DWR ¡ª §ã§à§Ó§â§Ö§Þ§Ö§ß§ß§í§Û §è§Ú§æ§â§à§Ó§à§Û §Ú§Ù§à§Ý§ñ§ä§à§â, §Ü§à§ä§à§â§í§Û §á§Ö§â§Ö§à§á§â§Ö§Õ§Ö§Ý§ñ§Ö§ä §ã§ä§Ñ§ß§Õ§Ñ§â§ä§í §ï§Ý§Ö§Ü§ä§â§Ú§é§Ö§ã§Ü§à§Û §Ú§Ù§à§Ý§ñ§è§Ú§Ú. §¿§ä§à §å§ã§ä§â§à§Û§ã§ä§Ó§à, §â§Ñ§Ù§â§Ñ§Ò§à§ä§Ñ§ß§ß§à§Ö §Õ§Ý§ñ §à§Ò§Ö§ã§á§Ö§é§Ö§ß§Ú§ñ §Ò§Ö§ã§á§â§Ö§è§Ö§Õ§Ö§ß§ä§ß§à§Û §Ò§Ö§Ù§à§á§Ñ§ã§ß§à§ã§ä§Ú §Ú §á§â§à§Ú§Ù§Ó§à§Õ§Ú§ä§Ö§Ý§î§ß§à§ã§ä§Ú, §ñ§Ó§Ý§ñ§Ö§ä§ã§ñ §Ü§Ý§ð§é§Ö§Ó§í§Þ §Ü§à§Þ§á§à§ß§Ö§ß§ä§à§Þ §Õ§Ý§ñ §á§â§Ú§Ý§à§Ø§Ö§ß§Ú§Û, §ä§â§Ö§Ò§å§ð§ë§Ú§ç §ß§Ñ§Õ§Ö§Ø§ß§à§Û §Ú§Ù§à§Ý§ñ§è§Ú§Ú §á§Ö§â§Ö§Õ §Ý§Ú§è§à§Þ §ã§Ý§à§Ø§ß§à§Û §ï§Ý§Ö§Ü§ä§â§Ú§é§Ö§ã§Ü§à§Û §ã§â§Ö§Õ§í.


§°§ã§ß§à§Ó§ß§í§Ö §ç§Ñ§â§Ñ§Ü§ä§Ö§â§Ú§ã§ä§Ú§Ü§Ú:


§±§à§Ó§í§ê§Ö§ß§Ú§Ö §Ò§Ö§Ù§à§á§Ñ§ã§ß§à§ã§ä§Ú:

ISO7842DWR §Ó§Ü§Ý§ð§é§Ñ§Ö§ä §á§Ö§â§Ö§Õ§à§Ó§í§Ö §ä§Ö§ç§ß§à§Ý§à§Ô§Ú§Ú §Ú§Ù§à§Ý§ñ§è§Ú§Ú, §à§Ò§Ö§ã§á§Ö§é§Ú§Ó§Ñ§ð§ë§Ú§Ö §Ó§í§ã§à§Ü§Ú§Û §å§â§à§Ó§Ö§ß§î §Ù§Ñ§ë§Ú§ä§í §à§ä §ã§Ü§Ñ§é§Ü§à§Ó §ß§Ñ§á§â§ñ§Ø§Ö§ß§Ú§ñ, §á§Ö§â§Ö§ç§à§Õ§ß§í§ç §á§Ö§â§Ú§à§Õ§à§Ó §Ú §Õ§â§å§Ô§Ú§ç §á§à§ä§Ö§ß§è§Ú§Ñ§Ý§î§ß§í§ç §à§á§Ñ§ã§ß§à§ã§ä§Ö§Û. §¿§ä§à §Õ§Ö§Ý§Ñ§Ö§ä §Ö§Ô§à §Ú§Õ§Ö§Ñ§Ý§î§ß§í§Þ §Ó§í§Ò§à§â§à§Þ §Õ§Ý§ñ §á§â§Ú§Þ§Ö§ß§Ö§ß§Ú§ñ, §Ô§Õ§Ö §Ò§Ö§Ù§à§á§Ñ§ã§ß§à§ã§ä§î §Ú§Þ§Ö§Ö§ä §á§Ö§â§Ó§à§ã§ä§Ö§á§Ö§ß§ß§à§Ö §Ù§ß§Ñ§é§Ö§ß§Ú§Ö.


§£§í§ã§à§Ü§Ñ§ñ §ã§Ü§à§â§à§ã§ä§î §á§Ö§â§Ö§Õ§Ñ§é§Ú §Õ§Ñ§ß§ß§í§ç:

§¢§Ý§Ñ§Ô§à§Õ§Ñ§â§ñ §Ó§í§ã§à§Ü§à§ã§Ü§à§â§à§ã§ä§ß§à§Þ§å §è§Ú§æ§â§à§Ó§à§Þ§å §Ú§ß§ä§Ö§â§æ§Ö§Û§ã§å §ï§ä§à§ä §Ú§Ù§à§Ý§ñ§ä§à§â §á§à§Õ§Õ§Ö§â§Ø§Ú§Ó§Ñ§Ö§ä §Ó§í§ã§à§Ü§å§ð §ã§Ü§à§â§à§ã§ä§î §á§Ö§â§Ö§Õ§Ñ§é§Ú §Õ§Ñ§ß§ß§í§ç, §é§ä§à §Õ§Ö§Ý§Ñ§Ö§ä §Ö§Ô§à §á§â§Ú§Ô§à§Õ§ß§í§Þ §Õ§Ý§ñ §Ú§ã§á§à§Ý§î§Ù§à§Ó§Ñ§ß§Ú§ñ §Ó §á§â§Ú§Ý§à§Ø§Ö§ß§Ú§ñ§ç, §ä§â§Ö§Ò§å§ð§ë§Ú§ç §Ò§í§ã§ä§â§à§Û §Ú §ß§Ñ§Õ§Ö§Ø§ß§à§Û §á§Ö§â§Ö§Õ§Ñ§é§Ú §Õ§Ñ§ß§ß§í§ç. §¢§å§Õ§î §ä§à §á§â§à§Þ§í§ê§Ý§Ö§ß§ß§Ñ§ñ §Ñ§Ó§ä§à§Þ§Ñ§ä§Ú§Ù§Ñ§è§Ú§ñ §Ú§Ý§Ú §ã§Ú§ã§ä§Ö§Þ§í §ã§Ó§ñ§Ù§Ú, ISO7842DWR §â§Ñ§Ù§â§Ñ§Ò§à§ä§Ñ§ß §Õ§Ý§ñ §å§Õ§à§Ó§Ý§Ö§ä§Ó§à§â§Ö§ß§Ú§ñ §á§à§ä§â§Ö§Ò§ß§à§ã§ä§Ö§Û §ã§à§Ó§â§Ö§Þ§Ö§ß§ß§í§ç §Ó§í§ã§à§Ü§à§á§â§à§Ú§Ù§Ó§à§Õ§Ú§ä§Ö§Ý§î§ß§í§ç §á§â§Ú§Ý§à§Ø§Ö§ß§Ú§Û.


§¬§à§Þ§á§Ñ§Ü§ä§ß§í§Û §Õ§Ú§Ù§Ñ§Û§ß §Õ§Ý§ñ §ï§æ§æ§Ö§Ü§ä§Ú§Ó§ß§à§Ô§à §Ú§ã§á§à§Ý§î§Ù§à§Ó§Ñ§ß§Ú§ñ §á§à§Þ§Ö§ë§Ö§ß§Ú§Û:

§¬§à§Þ§á§Ñ§Ü§ä§ß§í§Û §æ§à§â§Þ§à§Ó§í§Û §æ§Ñ§Ü§ä§à§â ISO7842DWR §à§Ò§Ö§ã§á§Ö§é§Ú§Ó§Ñ§Ö§ä §Ò§Ö§ã§á§Ö§â§Ö§Ò§à§Û§ß§å§ð §Ú§ß§ä§Ö§Ô§â§Ñ§è§Ú§ð §Ó §á§â§à§ã§ä§â§Ñ§ß§ã§ä§Ó§Ö§ß§ß§à-§à§Ô§â§Ñ§ß§Ú§é§Ö§ß§ß§í§Ö §ã§â§Ö§Õ§í §Ò§Ö§Ù §å§ë§Ö§â§Ò§Ñ §Õ§Ý§ñ §æ§å§ß§Ü§è§Ú§à§ß§Ñ§Ý§î§ß§à§ã§ä§Ú. §¿§ä§Ñ §æ§å§ß§Ü§è§Ú§ñ §á§à§Ù§Ó§à§Ý§ñ§Ö§ä §Ñ§Õ§Ñ§á§ä§Ú§â§à§Ó§Ñ§ä§î §Ö§Ô§à §Ü §ê§Ú§â§à§Ü§à§Þ§å §Ü§â§å§Ô§å §à§Ò§Ý§Ñ§ã§ä§Ö§Û §á§â§Ú§Þ§Ö§ß§Ö§ß§Ú§ñ, §Ô§Õ§Ö §â§Ö§ê§Ñ§ð§ë§Ö§Ö §Ù§ß§Ñ§é§Ö§ß§Ú§Ö §Ú§Þ§Ö§Ö§ä §à§á§ä§Ú§Þ§Ú§Ù§Ñ§è§Ú§ñ §á§â§à§ã§ä§â§Ñ§ß§ã§ä§Ó§Ñ.


§º§Ú§â§à§Ü§Ú§Û §ä§Ö§Þ§á§Ö§â§Ñ§ä§å§â§ß§í§Û §Õ§Ú§Ñ§á§Ñ§Ù§à§ß:

ISO7842DWR §â§Ñ§Ò§à§ä§Ñ§Ö§ä §Ó §ê§Ú§â§à§Ü§à§Þ §ä§Ö§Þ§á§Ö§â§Ñ§ä§å§â§ß§à§Þ §Õ§Ú§Ñ§á§Ñ§Ù§à§ß§Ö, §à§Ò§Ö§ã§á§Ö§é§Ú§Ó§Ñ§ñ §ã§ä§Ñ§Ò§Ú§Ý§î§ß§à§ã§ä§î §Ú §ß§Ñ§Õ§Ö§Ø§ß§à§ã§ä§î §Ó §â§Ñ§Ù§Ý§Ú§é§ß§í§ç §ï§Ü§à§Ý§à§Ô§Ú§é§Ö§ã§Ü§Ú§ç §å§ã§Ý§à§Ó§Ú§ñ§ç. §¿§ä§Ñ §å§ß§Ú§Ó§Ö§â§ã§Ñ§Ý§î§ß§à§ã§ä§î §Õ§Ö§Ý§Ñ§Ö§ä §Ö§Ô§à §ß§Ñ§Õ§Ö§Ø§ß§í§Þ §Ó§í§Ò§à§â§à§Þ §Õ§Ý§ñ §á§â§Ú§Þ§Ö§ß§Ö§ß§Ú§ñ §Ó §â§Ñ§Ù§Ý§Ú§é§ß§í§ç §Ü§Ý§Ú§Þ§Ñ§ä§Ú§é§Ö§ã§Ü§Ú§ç §Ú §á§â§à§Þ§í§ê§Ý§Ö§ß§ß§í§ç §å§ã§Ý§à§Ó§Ú§ñ§ç.


§¯§Ñ§Õ§Ö§Ø§ß§Ñ§ñ §á§â§à§Ú§Ù§Ó§à§Õ§Ú§ä§Ö§Ý§î§ß§à§ã§ä§î EMC:

§²§Ñ§Ù§â§Ñ§Ò§à§ä§Ñ§ß§ß§í§Û §Õ§Ý§ñ §Þ§Ú§ß§Ú§Þ§Ú§Ù§Ñ§è§Ú§Ú §ï§Ý§Ö§Ü§ä§â§à§Þ§Ñ§Ô§ß§Ú§ä§ß§í§ç §á§à§Þ§Ö§ç, ISO7842DWR §ã§á§à§ã§à§Ò§ã§ä§Ó§å§Ö§ä §á§à§Ó§í§ê§Ö§ß§Ú§ð §ï§Ý§Ö§Ü§ä§â§à§Þ§Ñ§Ô§ß§Ú§ä§ß§à§Û §ã§à§Ó§Þ§Ö§ã§ä§Ú§Þ§à§ã§ä§Ú (EMC) §Ó §ï§Ý§Ö§Ü§ä§â§à§ß§ß§í§ç §ã§Ú§ã§ä§Ö§Þ§Ñ§ç. §¿§ä§à §Ü§â§Ñ§Û§ß§Ö §Ó§Ñ§Ø§ß§à §Õ§Ý§ñ §ã§à§ç§â§Ñ§ß§Ö§ß§Ú§ñ §è§Ö§Ý§à§ã§ä§ß§à§ã§ä§Ú §ã§Ú§Ô§ß§Ñ§Ý§Ñ §Ú §ã§ß§Ú§Ø§Ö§ß§Ú§ñ §â§Ú§ã§Ü§Ñ §Ó§Þ§Ö§ê§Ñ§ä§Ö§Ý§î§ã§ä§Ó§Ñ §Ó §é§å§Ó§ã§ä§Ó§Ú§ä§Ö§Ý§î§ß§í§Ö §á§â§Ú§Ý§à§Ø§Ö§ß§Ú§ñ.


§³§Ö§â§ä§Ú§æ§Ú§Ü§Ñ§è§Ú§ñ §Ó §ã§à§à§ä§Ó§Ö§ä§ã§ä§Ó§Ú§Ú §ã §ä§â§Ö§Ò§à§Ó§Ñ§ß§Ú§ñ§Þ§Ú §à§ä§â§Ñ§ã§Ý§Ú:

ISO7842DWR §ã§à§à§ä§Ó§Ö§ä§ã§ä§Ó§å§Ö§ä §à§ä§â§Ñ§ã§Ý§Ö§Ó§í§Þ §ã§ä§Ñ§ß§Õ§Ñ§â§ä§Ñ§Þ, §à§ä§Ó§Ö§é§Ñ§Ö§ä §ä§â§Ö§Ò§à§Ó§Ñ§ß§Ú§ñ§Þ §ã§à§à§ä§Ó§Ö§ä§ã§ä§Ó§å§ð§ë§Ú§ç §ã§Ö§â§ä§Ú§æ§Ú§Ü§Ñ§ä§à§Ó §Ò§Ö§Ù§à§á§Ñ§ã§ß§à§ã§ä§Ú §Ú §á§â§à§Ú§Ù§Ó§à§Õ§Ú§ä§Ö§Ý§î§ß§à§ã§ä§Ú. §¿§ä§à §à§Ò§Ö§ã§á§Ö§é§Ú§Ó§Ñ§Ö§ä §ã§à§à§ä§Ó§Ö§ä§ã§ä§Ó§Ú§Ö §å§ã§ä§â§à§Û§ã§ä§Ó§Ñ §ã§Ñ§Þ§í§Þ §á§à§ã§Ý§Ö§Õ§ß§Ú§Þ §ß§à§â§Þ§Ñ§ä§Ú§Ó§ß§í§Þ §ã§ä§Ñ§ß§Õ§Ñ§â§ä§Ñ§Þ, §à§Ò§Ö§ã§á§Ö§é§Ú§Ó§Ñ§ñ §ã§á§à§Ü§à§Û§ã§ä§Ó§Ú§Ö §Õ§Ý§ñ §á§à§Ý§î§Ù§à§Ó§Ñ§ä§Ö§Ý§Ö§Û.


§°§Ò§Ý§Ñ§ã§ä§Ú §á§â§Ú§Þ§Ö§ß§Ö§ß§Ú§ñ:

ISO7842DWR §ß§Ñ§ç§à§Õ§Ú§ä §á§â§Ú§Þ§Ö§ß§Ö§ß§Ú§Ö §Ó §â§Ñ§Ù§Ý§Ú§é§ß§í§ç §à§ä§â§Ñ§ã§Ý§ñ§ç §á§â§à§Þ§í§ê§Ý§Ö§ß§ß§à§ã§ä§Ú, §Ó§Ü§Ý§ð§é§Ñ§ñ, §Ó §é§Ñ§ã§ä§ß§à§ã§ä§Ú:


§±§â§à§Þ§í§ê§Ý§Ö§ß§ß§Ñ§ñ §Ñ§Ó§ä§à§Þ§Ñ§ä§Ú§Ù§Ñ§è§Ú§ñ

§³§Ú§ã§ä§Ö§Þ§í §ï§Ý§Ö§Ü§ä§â§à§ã§ß§Ñ§Ò§Ø§Ö§ß§Ú§ñ

§³§Ú§ã§ä§Ö§Þ§í §ã§Ó§ñ§Ù§Ú

§¡§Ó§ä§à§Þ§à§Ò§Ú§Ý§î§ß§Ñ§ñ §ï§Ý§Ö§Ü§ä§â§à§ß§Ú§Ü§Ñ

§®§Ö§Õ§Ú§è§Ú§ß§ã§Ü§à§Ö §à§Ò§à§â§å§Õ§à§Ó§Ñ§ß§Ú§Ö §Ú §á§â§Ú§ß§Ñ§Õ§Ý§Ö§Ø§ß§à§ã§ä§Ú

3. §©§Ñ§Ü§Ý§ð§é§Ö§ß§Ú§Ö:

ISO7842DWR §å§ã§ä§Ñ§ß§Ñ§Ó§Ý§Ú§Ó§Ñ§Ö§ä §ß§à§Ó§í§Û §ã§ä§Ñ§ß§Õ§Ñ§â§ä §Õ§Ý§ñ §ä§Ö§ç§ß§à§Ý§à§Ô§Ú§Ú §ï§Ý§Ö§Ü§ä§â§Ú§é§Ö§ã§Ü§à§Û §Ú§Ù§à§Ý§ñ§è§Ú§Ú, §ã§à§é§Ö§ä§Ñ§Ö§ä §Ò§Ö§Ù§à§á§Ñ§ã§ß§à§ã§ä§î, §á§â§à§Ú§Ù§Ó§à§Õ§Ú§ä§Ö§Ý§î§ß§à§ã§ä§î §Ú §å§ß§Ú§Ó§Ö§â§ã§Ñ§Ý§î§ß§à§ã§ä§î §Ó §Ü§à§Þ§á§Ñ§Ü§ä§ß§à§Û §Ü§à§ß§ã§ä§â§å§Ü§è§Ú§Ú. §°§Ò§Ý§Ñ§Õ§Ñ§ñ §â§Ñ§ã§ê§Ú§â§Ö§ß§ß§í§Þ§Ú §Ó§à§Ù§Þ§à§Ø§ß§à§ã§ä§ñ§Þ§Ú §Ú §ã§à§à§ä§Ó§Ö§ä§ã§ä§Ó§å§ð§ë§Ú§Þ§Ú §à§ä§â§Ñ§ã§Ý§Ö§Ó§í§Þ §ä§â§Ö§Ò§à§Ó§Ñ§ß§Ú§ñ§Þ §ã§Ö§â§ä§Ú§æ§Ú§Ü§Ñ§è§Ú§ñ§Þ§Ú, §à§ß§Ñ §á§â§Ö§Õ§ã§ä§Ñ§Ó§Ý§ñ§Ö§ä §ã§à§Ò§à§Û §Ô§à§ä§à§Ó§à§Ö §â§Ö§ê§Ö§ß§Ú§Ö §Õ§Ý§ñ §Ú§ß§Ø§Ö§ß§Ö§â§à§Ó §Ú §â§Ñ§Ù§â§Ñ§Ò§à§ä§é§Ú§Ü§à§Ó, §Ú§ë§å§ë§Ú§ç §ß§Ñ§Õ§Ö§Ø§ß§í§Û §è§Ú§æ§â§à§Ó§à§Û §Ú§Ù§à§Ý§ñ§ä§à§â §Õ§Ý§ñ §ã§Ý§à§Ø§ß§í§ç §á§â§Ú§Ý§à§Ø§Ö§ß§Ú§Û. §°§Ò§ß§à§Ó§Ý§Ö§ß§Ú§Ö §Õ§à ISO7842DWR §Ú §à§á§í§ä §ß§à§Ó§à§Û §ï§â§í §ï§Ý§Ö§Ü§ä§â§Ú§é§Ö§ã§Ü§à§Û §Ú§Ù§à§Ý§ñ§è§Ú§Ú §ã§à§Ó§Ö§â§ê§Ö§ß§ã§ä§Ó§à


Все оценки(0)
соответствует описанию
0

  • Очень недоволен
  • Недоволен
  • Общие
  • Удовлетворение
  • Очень доволен
§±§à§Ø§Ñ§Ý§å§Û§ã§ä§Ñ, §Ù§Ñ§á§à§Ý§ß§Ú§ä§Ö §æ§à§â§Þ§å §Õ§Ý§ñ §ã§Ó§ñ§Ù§Ú!
больше
§¯§Ñ§Ù§Ó§Ñ§ß§Ú§Ö §Ü§à§Þ§á§Ñ§ß§Ú§Ú *
§¬§à§ß§ä§Ñ§Ü§ä§ß§à§Ö §Ý§Ú§è§à *
§¯§à§Þ§Ö§â §ä§Ö§Ý§Ö§æ§à§ß§Ñ *
§¿§Ý§Ö§Ü§ä§â§à§ß§ß§Ñ§ñ §á§à§é§ä§Ñ *
§³§ä§â§Ñ§ß§Ñ *
§³§à§è§Ú§Ñ§Ý§î§ß§í§Ö §ã§Ö§ä§Ú §¬§à§ß§ä§Ñ§Ü§ä§í

HK JDW §¿§­§¦§¬§´§²§°§¯§¯§½§«

§¬§°., §°§¤§²§¡§¯§ª§¹§¦§¯§¯§½§«



§´§Ö§Ý§Ö§æ§à§ß£º+86 135 3776 0076

§¶§Ñ§Ü§ã£º+86 0755 23610956

§ä§Ö§Ý§Ö§æ§à§ß£º +86 0755 23610956

§¿§Ý§Ö§Ü§ä§â§à§ß§ß§Ñ§ñ §á§à§é§ä§Ñ£º jindawei@hkjdw-chip.cn

§¡§Õ§â§Ö§ã: 25F, §Ù§Õ§Ñ§ß§Ú§Ö C, §Ù§Õ§Ñ§ß§Ú§Ö §ï§Ý§Ö§Ü§ä§â§à§ß§ß§í§ç §ä§Ö§ç§ß§à§Ý§à§Ô§Ú§Û, ¡í 2070 Shennan Middle Road, §â§Ñ§Û§à§ß §¶§å§ä§ñ§ß§î, §º§ï§ß§î§é§Ø§ï§ß§î, §¬§Ú§ä§Ñ§Û


Copyright 2023 HK JDW ELECTRONIC CO., LIMITED | §£§ã§Ö §á§â§Ñ§Ó§Ñ §Ù§Ñ§ë§Ú§ë§Ö§ß§í.

¡Á
seo seo