Color: black, whitematerial: plasticProjection distance: 1-6mTemperature measurement accuracy: +/- 1Humidity measurement accuracy: +/- 5%Humidity detection: 20%~99%Temperature detection: -9 to +60 (14.2~140)Projector rotation angle: 180Calendar display: 2001-2099Clock size L * W * Hcm: 15*2.5*11cm/5.9*0.99*4.33inchPower supply: 2 AAA size 1.5V batteries (not included) or USB-3.5mm DC charging cableFeatures:1. Time, LED backlight, 12/24 hour time format2. Snooze function (5 minutes)3. Display time (12HR / 24HR), calendar, week4. Display indoor temperature ( or ) and humidity5. Indicating comfort: sad face (dry), smiling face (comfortable), changing face (wet)6. When the DC adapter is used for power supply, the LED backlight is always on, and can be in 3 brightness levels: strong light (daytime) dim light (for dark night) light off7. When powered by a battery, the LCD screen will dim to save power. Only 12 seconds after each press to light up the LED backlightSpecial Note:1. Try not to use high-power alkaline batteries for alarm clock batteries. It is recommended that you buy carbon batteries.2. Long-time projection and long-bright backlight can be used with external power supply, but long-time projection and long-bright backlight cannot be used with batteries3. When the projection clock is 2 meters away from the receiving wall or ceiling, the height of the projected font is about 20 cmWhen the projection clock is 6 meters away from the receiving wall or ceiling, the height of the projected font is about 60 cm