Main technical parameters Operating frequency: 2.4GHz~2.483GHz Antenna: PCB unipolar antenna Output power: -18dBm~0dBm Receiver sensitivity: -90dBm Operating current: < 18uA Recognition distance: 20~200m (depending on the antenna) Read/write time: 500ms Erase life: 10 years Battery: 3.0V battery, 2 years life (battery replaceable) Power alarm: low battery alarm function Operating temperature: -20°C~+60°C Material: ABS, V0 fire rating Button: It has a …