This non-rechargeable Lithium-Thionyl Chloride battery is specifically designed for Wireless Siren Product Features: Voltage: 3.6 Volt Capacity: 14000 mAh Battery Chemistry: Li-SOCl2 Part Number: TCT1-XML-3613 Battery Replacement This battery works for the following models: ER34615M/W200 Battery ER34615M/W200(A) Battery 0-9912-K Battery 09912K MCS-710 Battery MCS710 MCS-730 Battery MCS730 MCS-720 Battery MCS720 381300 Battery MCS-730AC Battery ER34615M Battery Pro Battery Siren