The SEER AMB-300 is a laser SLAM autonomous mobile robot chassis measuring 1,000 by 700 by 200 mm and weighing 144 kg with a 300 kg rated load capacity and 1,040 mm rotation diameter. It shares the same flexible upper-structure mounting system as the AMB-150 with four mounting holes for lifting mechanisms, rollers, robotic arms, latent traction, and pan-tilt systems. Multiple navigation methods of laser SLAM, laser reflector, and QR code achieve repeated positioning accuracy up to ±2 mm (standard ±5 mm with ±0.5-degree angle). A 48 V 40 Ah lithium iron phosphate battery provides 12-hour runtime with under 1.5-hour fast charging, supporting manual, automatic, and fast battery swap methods. The chassis clears 25 mm ground height with a 228 mm laser scanning height. Passability handles up to 5 percent slopes, 5 mm steps, and 30 mm gaps with an 840 mm minimum aisle width at up to 1.4 m/s. Standard features include E-stop button, speaker, ambient lamp, Wi-Fi roaming, and automatic charging. Optional features include dual LiDAR, shelf recognition, laser reflector navigation, 3D obstacle avoidance, and QR code precise positioning. EMC and UN38.3 certified. Targets industrial logistics and warehouse material handling.