Flashing sticker 1. Can be pasted on the backside of the mobile, no need any battery, when calls coming or answer the phone, it will emit beautiful lights and make you more attractive. 2. Suitable for GSM mobile phone without antenna at frequency 900GHz~1800GHz. 3. Reduce the radiation to human brain. 4. Can custom any shape/logo/LED light color/paper card as client need. Good for company/party promotion. 5. CE, RoHS, EN71 certified 6. Material: Crystal glue + PCB board + LED lights.