Stand-alone speech diallers that can complement any system requiring alerts of changes in system conditions, including temperature monitoring. All messages are sent over GSM enabling SMS and speech messages, or standard PSTN line (SD3 only). Personalised voice messages can be transmitted to up to ten recipients. A complete unit, with keypad and display for programming and set up. With builtin programmable outputs which can be operated remotely over PSTN or GSM. The integrated microphone and speaker adds to the ability to listen in and speak to the site remotely.