Sensor: Semiconductor Radon Gas Sensor Measurement range: 3.3 /m³-37 kBq/m³(0.09-1000 pCi/L) Measurement accuracy: ± 15% First data display time: 6 hours Reliable data measurement time: When the radon concentration exceeds 190 /m³: 6 hours later When the radon concentration is between 94-190 /m³: after 12 hours When the radon concentration is below 94 /m³: 24 hours later Data update time: 60 minutes Battery life: 45 days (with the screen turned off) Charging interface: TYPE-C interface Charging status: Green light is always on Full state: Green light off Charging time: about 3.5 hours to fully charge (in shutdown state) Alarm method: Sound for 20 seconds per hour after exceeding the standard Detection environment: Temperature: -10℃-45℃ (-14℉-113℉) Relative humidity (RH):Less than 90% (Inaccurate data when working beyond the scope) Color:Black Material:plastic Package Contents: 1 * Radon Detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.