problems from extended usage of electronic devices areissues among primary school children. This study is aimedto investigate the prevalence of physical and behaviouralcomplaints arising from the electronic device usage and toidentify the potential factors that predicted the complaints.Methods: This was a primary school-based cross-sectionalstudy using multistage cluster sampling, conducted at Baudistrict in Sarawak, Malaysia in 40 primary schools. Aquestionnaire was used to collect information of usagepattern in insufficient lighting, timing and position. Thephysical and behavioural complaints were traced. Dataanalysis was performed using SPSS version 22. A p-value <0.05 with 95% CI was considered as statistically significant. Results: About 52.8% of the 569 students used digitaldevices in a bright room, 69.8% in the day time and 54.4% insitting position. The physical complaints were headache(32.9%), neck, shoulder and back pain (32.9%) followed by byeye strain (31.8%). Regarding behavioural problems, 25.7% ofthe students had loss of interest in study and outdooractivities (20.7%), skipped meals (19.0%) andarguments/disagreements with parents (17.9%). After logisticregression analysis, the lying position (OR=1.71, 95% CI:1.096, 2.688) and darkroom lighting (OR=2.323 95% CI: 1.138,4.744) appeared to be potential predictors of the complaint.Conclusion: One-quarter of the students studiedexperienced physical complaints, and one-fifth hadbehavioural problems associated with the use of electronicdevices. Lying position and darkroom lighting are thepotential predictors of complaints. Therefore, we suggestthat the children should use electronic devices in the sittingposition with adequate room lighting.