... Program School Bell/Ring Timer Working voltage Conventional voltage: AC220V Other: AC380V, AC220V, AC110V, DC12V, DC24V, DC36VModelZYT08ZYT22Load capacityResistance 25AAC Voltage output ... times ringing as the figures.2. To choose the program serial number, press “+” to change it to 05, press “manual” key ... 3. Long press “MODE” key, make the system return to the clock state.4. Press “MANU” key, make the ...