2 Pcs Electronic Accessories: 1 x Battery Holder & 1 x Low voltage alarmUse for 1-8S Lipo / Li-ion / Li-Mn / Li-FeVoltage detection precision: +/- 0.01V, Unit voltage display range.0.5 - 4.5V voltage range display Total: 0.5 - 36V1 S test mode voltage range: 3.7 - 30VProduct Name: Battery HolderMode low alarm voltage for the 2-8 SAlarm set value range: OFF - 2.7 - 3.8VLow voltage alarm Size: 39mm x 24mm x 9mmfor 1 cell 3.7V and 8 cells LiPo 29.6V.The alarm voltage is 3.3 v, the min.voltage can be adjusted with the knob.The sounds of alarm and red light to alert you when the battery voltage is too low.It can prevent your lipo battery damage due to low voltage.Carcase size: 7.5 x 6 x 2 cm / 7.62 cm x 6.1 cm x 1.98 cm (L x W x H)Total weight: 18 GCable length (each): 15 cm / 14.99 cmBattery type: 3 x 18650 3.7 V batteryMaterial: plastic + metal + PCBColor: As shownPackage Contents:1 x Battery Holder1 x Low voltage alarmOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.