Mini Spy sound (voice) recorder with external microphone + WIFI + live sound transmission via APP + battery life up to 125 days | Cool Mania
Amazon.com: SpyX / Micro Sonic Listener - Spy Toy Listening Device with Over-The-Ear Design. A Perfect Hands Free Addition for Your spy Gear Collection! : Toys & Games
SPY Bluetooth Microphone - Hackster.io
Custom Built Voice Activated Spy Audio Recorder w/ Extremely Sensitive Extended microphone | Long Distance Recording By kawtco