CooMax Spy Earpiece GSM Hidden Wireless Earphones Invisible Headset Nano SIM Microphone Exam - Mini Secret Headphone Listening Device Hearing Cheating (Spy Vip Pro SuperMini Piece)

❮ Invisible Earpiece ❯ The Vip Pro SuperMini has a small size of 1.10 x 0.64 cm for maximum discretion, blending perfectly into the ear. This invisible earpiece is perfect for cheating in exams and for use in other situations requiring secret communication. ❮ Superior Sound Quality ❯ This invisible earpiece offers great sound quality and volume, thanks to its induction technology that allows the GSM Piece to transmit the sound to the earpiece in a clear and crisp manner. ❮ Connectivity and Compatibility ❯ The Vip Pro SuperMini GSM Piece lets you insert a nano SIM card to use the earpiece without a phone. Compatible with phone calls on GSM bands 900/1800 and LTE bands B1/B3/B5/B7/B8/B20 (2100/1800/850/2600/900/800MHz). ❮ Built-in Microphone ❯ The GSM Piece includes an ultra-sensitive integrated microphone ideal for secret whisper communication. ❮ Long Battery Life ❯ The Vip Pro SuperMini earpiece uses 337 / SR416SW batteries with a battery life of approximately 4 hours depending on volume. The inductive part is charged via the included USB cable, providing approximately 3 hours of battery life.