Feature : 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 . suitable for GSM mobile phone without antenna at widely frequency 900GHZ~1800GHZ . Reduce the radiation to human brain . can custom any shape/logo/LED light color/paper card as client need . good for company/party promotion . CE, ROHS,EN71 certified