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 Clock Material: Plastic Product Size: Approx. 21x2.3x9.8cm / 8.3x0.9x3.9in Gross Weight: 280g/9.9oz Power Supply: 5V USB Power Cord Battery 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 Manual Note: All data are measured manually, and there are certain errors in the measurement results.