RFID Electronic Keychain finder Thin card, Small keychain. Long distance keychain finder, OEM provide, custom logo accept Easy-find Keychain use wireless RF technology, function ... . 2. Size for Card: 84X55X3.8mm; 3. Size for keychain: 44X28X10mm 4. Beep sound: 75 DB; 5. Frequency: 433 ... 3V; Card size Card logo can be printed in colorful. Keychain Color: red, blue, pink, grey, yellow, and customzied, ...