Specifications :  Simple and Convenient Wireless Design Sensor + Speaker in one Built in – Loudspeaker 1 melody: Ding Dong sound only (melody 2 only) Low Energy Usage Signal range up to 1.5 meter Battery : AAA x 3 (not included) Pcs per Carton : 60 Pcs Barcode No : 499.366.984.591.3 Outer Carton Dimension : 36 x 35 x 21 Cm Gift Box Dimension : 8,5 x 6,5 x 6 Cm Kg per Carton : 8 Kg Gram per Pcs :  200 Gram NO. HS LABEL :  8531.80.10   Attention:  1. Please use good quality batteries and avoid using low or bad battery, pay attention to put the battery in right way.  2. Generally battery can last about 3-6 months, but it depends on the use frequency.  3. Please do not install the item in the rain, direct sunshine for a long time, strong magnetic interference, heavy cold and hot air place.  4. Both battery are not included in the package, you need to buy them by yourself, 3 AAA batteries.  5. This is a standalone indoor motion sensor