Oppo is a Chinese company known for making android smartphones and accessories. Many of its best products are budget or midrange devices, and the Oppo Watch Free fits nicely into this niche, settling in the centre of three products in the Oppo range.
The Oppo Watch and Oppo Band sit on either side of it, and they're priced respectively. The Oppo Watch Free though comes in at £89, which puts it in the region of the Fitbit Inspire 3 - likely its closest competitor in the fitness tracker market.
It's also around £40 cheaper than the Huawei Watch Fit 2 and has no real analogue in the smartwatch world, which is usually either less than £60 or over £100.