## 1 Introduction  
As one of the most essential polyunsaturated fatty acids (PUFAs), omega-3 (n-3) PUFAs play an important role in the development of human beings' nervous systems and protection against cardiovascular disease, as well as the prevention of breast and colorectal cancers [1; 2; 3]. With consumer's increasing awareness about health benefits of PUFAs [4], a variety of functional foods fortified with PUFAs have been developed, among which n-3 PUFAs enriched egg is becoming more and more popular. The egg is not only an important source of nutrients for the human being [5] but is also considered as an ideal delivery system for n-3 PUFAs, as its composition can be modified to more functions through the manipulation of laying hen diets [5; 6]. Hens fed with n-3 PUFAs enriched diets, such as fish oil, seaweed, and flaxseed can produce eggs enriched with n-3 PUFAs [3; 7] and provide a new way for the human being to enhance the intake of n-3 PUFAs in diets.  
Like conventional eggs, n-3 PUFAs enriched eggs are also highly perishable, whose freshness and quality start to decline as soon as laid by hens [8; 9; 10] and through the whole supply chain from poultry farm to consumers' dining table. Egg quality is further influenced by both extrinsic (suchas environmental conditions) and intrinsic factors (such as nutrients and water activity). The main environmental factors affecting these processes are the storage temperature and humidity [11; 12; 13; 14] as well as storage time [15] during commercial circulation after laying until consumption.  
Home storage is the last but not the least important stage in the eggs supply chain [16; 17; 18]. Refrigeration is believed to be the most commonly used method to preserve internal egg quality [19] at home, hence the eggs are recommended to be kept under refrigeration at home in the European Union (EU) countries [20] and Egg regulations of United States Department of Agriculture (USDA) [21] required the cooler should be capable of maintaining an ambient air temperature of 7.2 \({}^{\circ}\)C or lower and a relative humidity of 40 to 70 percent for a long time storage of eggs. However, there are no regulations or suggestions to tell consumers how to keep eggs at home in China yet. Data on the effects of storage conditions on n-3 PUFAs enriched eggs quality are very limited and even few studies have covered the time-temperature history of eggs after shopping until consumption during home storage.  
As an advanced technology, wireless sensor network (WSN) is a combination of sensor technology, embedded networking, wireless communication technology and the distributed processing [22]. It can sense and transmit the information of environments to the client-sides via the wireless network. WSN has many merits over a traditional data monitoring system [23] for its higher accuracy and speed on data acquisition, wireless and real-time transmission, better flexibility and lower costs, and has been widely used in many application areas including medical field [24; 25], food safety [26; 27; 28], environmental monitoring [29], and etc. Therefore, WSN is considered as a good choice to monitor the changes of environment for home storage of eggs.  
The objective of the present study is three-fold, (a) to quantify the effects of different home storage conditions (room temperatures vs. refrigeration) on shell eggs quality; (b) to compare the quality change between n-3 PUFAs enriched and conventional eggs; (c) to identify the optimum duration (days) to store shell eggs in a home refrigerator and under room temperature. The remainder of the paper is organized as follows: Section 2 describes the experimental design and the WSN based environment-monitoring scheme, Section 3 presents the temperature and humidity fluctuation monitored during the experiment and the quality changes of n-3 and conventional eggs during storage. The conclusions are provided in Section 4.