HW 9volts Battery is a nice brand with history of quality. It has been proven over the years about its consistency in satisfying its purpose in terms of effectiveness, durability & convenience. Is highly recommended for the use of toys, household, smoke alarm Wireless Microphone etc  Use them for Toys, Electronic Equipment, Radio's and other devices that requires this battery size! This battery is a high capacity and amp, low cost solution for many electronic devices. It is used with its specific battery snap, connector or clip. Sealed in package Model: 6F22M System: Zinc Carbon Nominal Voltage(V): 9V Discharge Resistance( and #x3A9, ): 620 Cut-off Voltage(V): 5.4 DISCHARGE TIME: 270HM,9HOURS Jacket: Metal Operating Temperature Range: (deg. C)** -20 to +85 Weight: (g)*** 2.0 Dimensions: 26. 5 H x 48. 5 W x 17. 5 L (mm) CERTIFICATION: ULCEROHSISO9001~2000 * Nominal capacity indicates duration until the voltage drops down, when discharged at a nominal discharge current at 20 deg. C. ** When using these batteries at temperatures outside the range of 0 to +40 deg. C, please check in advance for conditions of use. *** Dimensions and weight are for the battery itself, but may vary depending on the shape of terminals or other factors.