Located within the Pacific Ring of Fire, the Philippines faces frequent and severe earthquakes, showing the critical need for a search and rescue (SAR) technology to protect both victims and rescuers. Traditional SAR operations often put rescuers' lives at risk, especially in dangerous post-earthquake environments. The R.A.N.G.E.R. (Rescue and Navigation Ground Exploration Robot) was developed to support these operations in post-earthquake environments. This study evaluated the robot's performance, focusing on video transmission, communication reliability, battery life, and traversal capabilities. The research involved assembling a tank chassis with an ESP32 camera, two-way radio, motors, and batteries, protected by 3D-printed waterproof cases. Components like motor drivers and regulators were integrated, with control via a smartphone access point and software developed in Arduino IDE to manage operations. After the robot underwent various tests including a simulated field test, its performance was evaluated. The compact (26 x 23.5 x 15 cm) and lightweight (1.8 kg) robot demonstrated efficient navigation through debris-filled terrains. Communication tests showed "high effectiveness" scores of 95%–100%, while two-way radio communication remained clear up to 1.3 kilometers. The robot’s battery life averaged 4.26 hours, slightly below the theoretical 5.47 hours, and its traversal performance showed consistent results across various operator distances (p-value = 0.0637). These findings highlight R.A.N.G.E.R.'s reliability and adaptability, making it a valuable asset for SAR operations, with recommendations for improvements in video quality and battery optimization.