## 2 Literature Review  
Development of mHealth options for chronic disease has been increasing in recent years including LMICs that are mostly used by the health workers and the patients [21]. The health workers used mobile technology for health consultancy and health care management [16]. Meanwhile, the patients usually used the mobile technology for self-screening, monitoring and health education [19]. In some developing countries including Indonesia, health services are limited due to the shortage of health professionals who are willing to stay in the outreach areas. Accordingly, the community health workers play significant roles in supporting the health program implementation such as monthly health post meetings at the village or sub-village level within the primary health center coverage area. The health post is normally facilitated in the community by community health workers where a health worker visits and provides basic services for under-five, elderly or reproductive health [16]. The activities are considered as routine programs, but the implementation of mobile health for the community health workers is still limited [20]. Community health workers are not formal health professionals but are chosen voluntarily by community members, then they are trained and supervised through the health system [22]. Community health workers are involved in various health programs such as maternal and child health, nutrition, vaccination, NCDs, health emergency response and disease surveillance in their working areas. Community health worker workloads are often high so that if they are not supported by adequate supervision, training, remuneration, transportation and equipment, these will negatively affect the quality of performance, productivity, satisfaction and program effectiveness [21]. Mobile technology for community health workers can be used to ensure a more manageable workload, efficiency and facilitate supervision [21,23]. The PHC and the mobile apps have potential to integrate primary health centers and the existing community-based health services, especially during the COVID-19 pandemic. Portable medical devices consist of an anthropometric set (weight scales, C, and melting), vital signs (sphygromanometer, thermometer, and oximeter), peripheral blood tests kit (glucose, cholesterol, uric acid, and hemoglobin kit), urine examination sets (strips and urine pots), and personal protective equipment (PPE) (masks, hand gloves, hazard box, face shield, and hand sanitizer) as shown in Figure 1.  
The Android application was equipped with an algorithm to calculate the health risk of a patient based on 12 parameters. Teleconsultation urgency is divided into four stages: green (normal), yellow (caution), orange (remote medicine) and red (emergency) as shown in Table 1. The user interface is differentiated based on the field officer and teleconsultation provider. The field officer feature allows for patient search and registration, entry of examination results, generation of triage algorithms, teleconsultation and treatment. The doctor feature allows for telemonitoring and teleconsultation as well as drug administration (Figure 2). Figure 1: PHC Box. of health workers to the PHC implementation using the technology acceptance model, with their recommendations for sustainability and scaling-up. To ensure the validity and reliability, the instrument was piloted and all the reviewers were trained. Online training was used due to the COVID-19 pandemic situation. The training process was conducted at a predetermined time span for three days using WhatsApp auto-reply. The training modules consist of the flow of patient examinations, patient care, application usage, as well as health protocols and waste treatment. Each training participant was given pre-test and post-test questions to measure their understanding of the training material in each module and assignments at the end of the training.