... meters above in the open air.This souvenir key finder uses wireless RFID technology, which function is more stable, and no ... it is within the working distance. The beep will last for 6 seconds or longer (customized), then stop automatically.Batteries included ... , pink, grey, orange, and customzied, OEM acceptable, Logo print for free for over 3000pcs orderPackageproduct NW1. Card: 15.7g 2. Keychain:13 ...