With Walkie Talkie Mode, users can receive and send voxes handsfree from a bluetooth or wired headset, even if the Voxer app closed and the phone is locked.
Supported Wired Headsets (listen & record - button on the device can be used to send a message when the user has Walkie Talkie Mode enabled):
KOBRA Professional Security Headset Earpiece for iPhone or Android Devices
iASUS 500K Headset with PTT Button
Drift Single-Wire PTT Headset for Voxer
Supported Bluetooth Headsets (listen only - the button will not work on the headset to send a vox back with Walkie Talkie Mode):
Bluetooth headsets that support A2DP (music streaming) and Bluetooth 3.0+ should work for audio playback (listening to messages) but not for sending audio messages (responding).