Instrument features: the latest double-sided glass Moblie shape, more hidden, more convenient. Using the latest microcontroller program, the instrument output is more stable, the latest debug high-frequency rf signal, more suitable machine, because belong to uhf device flash alarm capacity is relatively stronger, compression capability is strong, adopts imported from transistor battery 9 pieces of 320 ma A lithium battery, battery durable instrument more stable work, 37.8 V chargers for charging directly, more stable power supply voltage.