Accessory Type:Battery Accessories Model Number:0903002-001~004 Size:63*29*18mm Weight:11.50g/pc Material:ABS Color:Black/Blue/Red Digital Hearing Aid Battery Tester Portable Battery Checker with Battery Holder 1. Product name: Digital battery tester 2. Size: 63*29*18mm (2.48*1.14*0.7)inch 3. Material: Plastic 4. Color: Black / Red /Blue 5. Certification available: CE, FCC 6. Private logo is available on request ( MOQ > 200 PCS) Description: 1. The battery tester is suit for cell, button and watch type batteries. Works by sliding battery against a contact 2. It is helpful in determining if the hearing aid is failing or if the batteries are dying. LCD read out shows amount of life left in battery 3. No batteries required for operation. 4. There is a storage compartment for 2 spare hearing aid batteries. Suits for size 10, size 13, size 312 and size 675 hearing aid batteries. Operation: Place the battery on the gold colored plate, with the "+"facing up (usually the smooth side of the battery facing up) and then slide/push the battery towards the LCD screen to get a reading on the battery's strength. It will tell you how strong the battery is. Please notice that the test should be fulfilled within 2 second Multiple Colors Available