Features They are suitable for DIY and maintenance of all kinds of dc equipment.Easy to install: The battery is fixed by a stainless steel spring. It is very convenient to install and replace the battery.Tough material: using tough material, not easy to crack.Different slots for batteries, meet your different using requirements. Features They are suitable for DIY and maintenance of all kinds of dc equipment.Easy to install: The battery is fixed by a stainless steel spring. It is very convenient to install and replace the battery.Tough material: using tough material, not easy to crack.Different slots for batteries, meet your different using requirements. Perfect for various DIY kits and projects Applications Electronic DIY, breadboard power supply, LED lighting power supply, low voltage electrical equipment, remote control, wireless keyboard, electronic calculators, doorbell, mobile digital recorder, remote control, radio, clock, electronic calculators, doorbell, etc. Applications Electronic DIY, breadboard power supply, LED lighting power supply, low voltage electrical equipment, remote control, wireless keyboard, electronic calculators, doorbell, mobile digital recorder, remote control, radio, clock, electronic calculators, doorbell, etc.