Product features Power supply:3 x AAA alkaline batteries (LR03)2 years battery life Dimensions: 4.7 x 2.7 x 1.0 inches / 120mm × 69mm × 25.5mm Weight: 5.2 ounces / 130g (with batteries) Operation environment:Temperature: 39°F to 104°F / 4°C to 40°CRelative Humidity: < 85% Power supply:3 x AAA alkaline batteries (LR03)2 years battery life Dimensions: 4.7 x 2.7 x 1.0 inches / 120mm × 69mm × 25.5mm Weight: 5.2 ounces / 130g (with batteries) Operation environment:Temperature: 39°F to 104°F / 4°C to 40°CRelative Humidity: < 85% Radon specifications Radon sampling: Passive diffusion chamber Detection method: Alpha spectrometry Measurement range:0 – 500 pCi/L0 - 9999 Bq/m³ Accuracy/precision at 5.4 pCi/L / 200 Bq/m3:After 7 days ~ 10 %After 2 months ~ 5% Radon sampling: Passive diffusion chamber Show More