9 Volt Alkaline Battery 

• DT Systems Micro iDT PLUS Handset
• DT Systems R.A.P.T 1400 Handset
• DT Systems DT 190 Bark Collar
• PetSafe In-Ground Fence Stubborn Collar 
• SportDog In-Ground Fence Stubborn Collar

Actual product brand may vary from the photo shown dependant on availability