photoelectric smoke+ heat alarm detector with 9VDC battery (CE approval)Features : - Ceiling or wall mounting - Easy to install with mounting hardware included - 9VDC battery - Suitable for any room - Flash alarm indicator (red) - Test button for easy recommended monthly testing - Low battery signal - Safety clip feature, not allow mounting of smoke alarm without battery installed - photoelectric chamber for early detection from all directions - Adjustable temperature to heat alarm:45~58 degree - Loud 85dB alarm signal