Waterproof ultrasonic distance sensor. This sensor can be used for collision detection in your project.
Programmable RC Vectoring Mobile Desk with 4 inch Mecanum Wheels. The mobile desk can drive in any direction and roll in under a bed allowing you to use your laptop with a secondary monitor while in bed.
YDLIDAR X4 LIDAR - 360-degree two-dimensional 10 meter laser range scanner (LIDAR).