20 alkaline batteries 8 adapters 1 tester at an amazing price 10 x mignon aa 8 x micro aaa 2 x 9v block 4 x baby c adapter 4 x mono d adapter 1 x battery tester comes supplied in practical storage box made of plastic the extensive 20 piece battery assortment and 8 useful adapters 4 x baby 4 x mono d are included in the set a handy battery tester is included that can be used for batteries and rechargeable batteries customary battery sizes can be tested aa aaa baby c an