Best-Selling Exam Gadget: Spy Bluetooth Earpiece Set. Guarantees SECRET WIRELESS COMMUNICATION at exams, tests, meetings, etc. Works with ALL MOBILE PHONES - Wireless connection via Bluetooth. Super small wireless SPY EARPIECE. Nude color, Clear sound, Fully hides inside ear. Highly sensitive microphone embedded into the Bluetooth loop perceives even whispering. You get full READY-TO-USE set + extra batteries included.