As this year is coming to an end, Xiaomi has launched the last wave of new smart home products for people who are still worrying about exchanging gifts and buying Christmas gifts at the last minute. This includes sweeping robot 2 Ultra dust collection version, wireless vacuum cleaner G11, three products of air purifier 4 series, air circulation purifier, Redmi watch 2 Lite and Redmi bracelet Pro. The 4 series of air purifiers are divided into three types: “4 Pro”, “4” and “4 LIte”, corresponding to about 10~18 pings (35~60 square meters), 8~14 pings (28~48 square meters) and 7~ 13…