Feature:1. LARGE SCREEN: Projection alarm clock has a large display that is easy to read and especially suitable for children and the elderly. It has temperature and humidity notification, alarm clock and time display functions.2. MIRROR DISPLAY DESIGN: Projection digital clock not only provides a clear view of the projected time on the ceiling, but the display can also be used as a mirror in daily use.3. USB CHARGING PORT: Ceiling digital alarm clock has a 5V USB output port so you can charge your smartphone while you sleep.4. HIGH BRIGHTNESS: Projection radioalarm clock uses a high brightness LED light source for clearer projection at night, without dazzling lights or anything annoying to disturb your sleep.5. 180 DEGREE ROTATION: LED digital projection alarm clock has 180 degree flexible projection swing arm, freely adjust the projection angle to project time on the ceiling or wall.6. DECORATIVE: Mirror LED projection alarm clock is full of technology and fashion, perfect for home decoration or on a small nightstand in children's bedroom.Specification:Item Type: Projection Alarm ClockMaterial: PlasticProduct Size: Approx. 21x2.3x9.8cm / 8.3x0.9x3.9inGross Weight: 280g/9.9ozPower Supply: 5V USB Power CordBattery Type: 1 x Button Cell, Model: CR2032 ( Shipped Without Battery)Indoor Temperature Range: 32‑122F (0‑50℃)Indoor Humidity Range: 20%‑95%Projection Effective Distance: 2‑5m/6.6-16.4ft, ( The Best Distance of 3 Meters/9.8in).Package List:1 x Projection Alarm Clock(Battery not included)1 x USB Cable1 x Instruction ManualNote:All data are measured manually, and there are certain errors in the measurement results.