Anonymous posted an answer for this Sims SVR-B445 Handheld Digital Voice Recorder:
"To select your message to erase depress REC/STOP button. Then "scroll" thru recordings by..."
Anonymous posted an answer for this Sims SVR-S825 Handheld Digital Voice Recorder:
"How to Record: 1. Make sure HOLD switch (on side of unit with pocket clip) is set to off..."