The suction cups soak in boiling water for a few minutes and clean the suction cup for better results. You need to clean the glass or other smooth surface with water or rubbing alcohol before applying. Specification 1. Materials: ABS 2. Measurements: Each candle measures approx. 0.9" diameter, H8" 3. Battery: 2-AA batteries(not included) 4. Flash mode: Warm white flicker 5. LED color: Warm white 6. Work Time: 400 hours 7. Remote: 10 keys 8. Remote battery: 1-CR2025 (included) Remote control instructions 1. ON/OFF: to control the candle light on or off 2. Timer: 2/4/6/8 hours; When it switches to 2H, the tealight lights up for 2 hours on and then automatically turns off for 22 hours. 24-hour cycle, same use on other timers (4/6/8 hours). 3. Mode: On the "candle" position, it will light but would flicker flame; On the "light" position, no-flicker, just like real flame. 4. Dim: This two switches could control the candle light brightness. Use and care 1.?Suction cups soak in warm water for a few minutes and clean the suction cup for better results.You need to clean the glass or other smooth surface with water or rubbing alcohol before applying. 2. Do not dispose of this product in a fire, battery inside may explode or leak 3. Remove the battery if the product will be unused for long period of time 4. Do not attempt to recharge battery 5. Do not use a different size or voltage battery than "AA" battery 6. Replace all batteries of a set at the same time 7. Remove used batteries promptly