VEVOR Electric Chain Hoist, 2200 lbs/1 ton Capacity, 10 ft Lifting Height, 10 ft/min Speed, 120V, Single Phase Overhead Crane with G100 Chain, 10 ft Wired Remote Control for Garage, Shop, Hotel, Home

The product has a one-year warranty, and free accessory replacement and technical consultation are provided within one year. Please refer to the link below for specific details. https://www.vevor.com/pages/return-policy

It is a single chain with hook.

While product information doesn't mention the emergency stop switch accessibility, it highlights the hoist's safety features like an emergency stop switch and electromagnetic brake system to prevent abnormal slipping.

I did not find any information about spare parts availability in the product description or customer reviews.

I did not find any reviews mentioning whether it can lift heavier loads than specified. The product description states its load capacity is 2200 lbs/1 ton with a 10 ft lifting height and 1400W motor for heavy loads.