... distance);Resolution:320 * 240Color Depth: input 24-bitOptical visible Angle:26 degree angleBattery:Built-in polymer battery, 3.7V 1000MAHMaximum ... 20KHzSNR >85dBWorking temperature: -5°C to 40°C Viewing angle: controllable degree is -15 degrees to 15 degreesNet weight: ... friendly, no radiation and no harm to your eyes.Advanced optical design, safe and comfortable.Big screen simulation, superb quality ...