Huaqiangbei

Huaqiangbei is the global capital of consumer electronics — a 1.5km×0.5km district where 50,000+ stalls sell every component imaginable. SEG Plaza is the canonical landmark (10 stories of electronics, with the rooftop observation deck up top). Other anchors: HQB Square (mostly gadgets and finished goods), Huaqiang Electronics Market (deeper into components — chips, circuit boards, raw parts), Shenzhen Electronics Mall (audio, drone, robotics). Tourists come for the spectacle and the cheap headphones / phone cases / mini-drones; hardware engineers come for the world's deepest supply chain in 4 city blocks. Bargain hard (start at 40% of asking), bring a translator app, and watch for counterfeits if buying brand-name. Most stalls take Alipay; the higher-end stores will accept Visa/Master.