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Specifications : -Muslims and flasher wireless external sensor charging solar -Frequency 433MHz EV1527 -Battery back up internal Lithium 2200 ML amp -Commissioning with the adapter and charging by sunlight -Tall, hear the sound of 110 dB with the ability to set alarm type and intensity of sound -Capability of connection 20 sensor wireless and remote control and 2 sensors with wire (device power output for Optical, with wire does not have) -Alone work, a Alarm without phone manufacturer to do that