The Tree LWC-HR wheelchair medical scale provides extra support with handrails on 3 sides of the 37.8" x 39.4" weighing platform. The platform is made of aluminum to decrease weight and has ramps for easy entry and exit of wheelchairs. Wheels are built into the scale base to make moving the scale easy. For continuous use the Tree LWC-HR can be powered by the included AC power adapter or for portable applications use 6 AA batteries (not included). The 5 button keypad keeps operation of the scale simple. The HOLD function allows the operator to freeze the weight on the display until the HOLD button is pressed again. This gives the operator time to record the weight after the wheelchair has been removed from the scale.