Pioneer Voice Monitoring Receiver VMR-M500 - Untested. Only the receiver shown in the photos is available (no listening earphones). As you may know, earphones equivalent to a sound collection microphone are required, but since only the receiver body is available, operation has not been confirmed. The only operational checks performed were: * Powering on * Inserting standard music earphones and confirming some change in response to volume adjustment Therefore, it is a junk item. No battery compartment leakage. Exterior has scratches. Some rust on exterior screws.