R&D INSTRUMENTS RD637 3 In 1 Digital Display Alarm Rechargeable Electromagnetic Radiation Tester 1. Detects three types of radiofrequency radiation (RF): WIFIPHONE (WIFI radiation), MICROWAVE (microwave radiation), MIXED (mixed electromagnetic radiation) 2. Detects three types of non-ionizing radiation: Electric Field (EF), Magnetic Field (MF), Radio Frequency (RF) 3. USB rechargeable with built-in high-capacity lithium battery for extended runtime 4. Three-color backlight and bar graph alerts provide additional visual assessment of radiation intensity alongside numerical readings 5. Auto-shutdown after 15 minutes of inactivity 6. Versatile applications: suitable for TVs, computers, home appliances, substations, mobile phones, base stations, etc Specifications 1. Measurement accuracy: ±5% 2. Measurement bandwidth: 40Hz-10GHz 3. Auto-off: default 15 minutes, can be disabled 4. Operating temperaturehumidity: temperature: -10 to +60°C; humidity: less than 80% RH 5. Battery capacity: 320mAh 6. Charging: 5V 500mA 7. Charging port: Type-C 8. Size: about 14.4 x 6.7 x 2.7cm 9. Weight: about 140g