Mainland ChinaShenzhen Lingbao Electronics Co., Ltd.has released model AK-228A, a heat alarm that can detect the temperature with high stability and reliability and give out light and sound warning when the environmental temperature reaches the warning point. The warning point is optional 60,70,80. The alarm can is compatible with wired or wireless network connection, which enable the host to receive the signal timely. It runs on optional 9V back battary that lasta up to one year, 12V DC/24V DC, 110V AC with 9V back-up battery or 240V AC with 9V battery.