Comrii Electronics Ltd. is based in China and lists smart doorbell and intercom products on Global Trade Plaza. The catalog includes a Smart Wifi Door Bell that operates on 2.4G WiFi 802.11 b/g/n or a wired network, offering full duplex talk, photo and video capture, and remote unlock functions. It features a 2‑megapixel resolution with IR‑cut night vision, supports up to 20 simultaneous users, weighs 0.65 kg, and ships in a 210×150×80 mm package. The company also offers an Intercom system – Door Controller comprising an outdoor doorbell and indoor monitors. The doorbell provides 2‑megapixel resolution with a 140° horizontal angle and IR‑cut black‑and‑white night vision, with power‑on or power‑off unlock options in a 145×88×39 mm housing. Indoor monitors come in 7‑inch or 10.1‑inch capacitive touch screens (1024×600), support up to two outdoor doorbells and six indoor monitors with inter‑monitor calling, connect via WiFi 802.11 b/g/n on the master unit, and share a 12V 2A power adapter in a 198×130×21 mm enclosure.