VoiceBooster Handheld Microphone for VoiceBooster (Aker) Voice Amplifiers by TK Products, LLC Made for use with all VoiceBooster and Aker Voice Amplifiers, Works with other brands. 3.5mm connection with 39 inch cord Small Handheld Style Microphone 3.5mm male connection The VoiceBooster brand is owned by TK Products, LLC. The VoiceBooster must be purchased through TK Products or one it's authorized dealers for Warranty Claims to be honored.