The use of activity-specific upper-limb prosthesis helps children with upper-limb loss to engage in functional and recreational activities, such as music and sports. The purpose of this study was to develop a modular activity-specific prosthesis and develop a remote-fitting procedure. We evaluated patient satisfaction after using the device for 8 weeks and evaluated anthropometric and range of motion (ROM) measurements of the residual limb after use of the prosthesis. We enrolled 7 children with unilateral trans-radial amputations between 7 and 12 years of age. The modular activity- specific prosthesis was specifically designed for playing musical instruments and sports. A survey was performed to evaluate items such as assistive device satisfaction, wear, comfort and use. Descriptive statistics were performed to calculate the mean and standard deviation of the scores recorded in the patient satisfaction survey. The larger standard deviations showed that the observations were more spread out which represents that the patients were satisfied after using the prosthesis after using it for 8 weeks. A dependent T-test was performed between the anthropometric and ROM measurements after use of the prosthesis. The main findings of this study were that an effective modular activity-specific prosthesis can be developed at a low-cost. Additionally, remote fitting procedures were developed. The results also showed that participants were satisfied with the devices after 8 weeks of use. Furthermore, we observed that for strength of the affected limb there was a significant main effect for wrist motion