Features: Necklace design, delicate and compact, easy to carry. History track: query the running track of equipment anytime and anywhere within three months. Geofence: Users select the electronic fence function on the mobile APP client, and set up a circular electronic fence on the map. If the device leaves the fence, the mobile APP client will display alarm information. Voice monitoring: Select voice monitoring function in setting up and fill in your mobile phone number, wait for while and after confirmation, equipment will be sent a calling to your number, you can listen to the voice around locator after answering. SOS call: With SOS button and two way voice function, kid's or seniors can press the SOS button for help and talk with the host when they are in emergency. GPS + LBS + Wi-Fi positioning: Device supports GPS, Wi-Fi and LBS positioning, GPS is mainly for outdoor positioning, Wi-Fi and LBS manly for indoor position. SMS monitoring number: After setting the short message monitoring number, the alarm short message and other notification short message sent by the device can be received. Language time zone settings: Language time zone setting is a function designed for foreign users, domestic users do not need to set it. Do Not Disturb: The non-interference mode mainly prevents calling a locator. It can set four groups of non-interference time. Within the time interval, it is impossible to call a locator. Various working modes: fast positioning, standard positioning, power saving positioning. (1) Fast positioning (1 minute GPS positioning): The equipment updates the position information at a time interval of 1 minute, and the fast positioning mode locator consumes electricity quickly. (2) Standard positioning (10-minute GPS positioning): The equipment updates the position information at 10-minute intervals. (3) Power-saving positioning (one hour GPS positioning): The equipment updates the position information at an hour interval, and the power-saving positioning mode positioner consumes less power. Multi-platform monitoring: support Android, Apple mobile phones and computers and other network clients. Global Universal: Support GSM Four Frequency Network, Voice Time Zone Settings, Built-in Global Access Parameters. Specifications: Battery capacity: 500 mAh Standby time: 5 days Positioning mode: GPS satellite positioning + AGPS auxiliary positioning + WIFI positioning + LBS base station positioning Positioning accuracy: GPS positioning 5-15 meters, WIFI positioning 15-100 meters, base station positioning 100-1000 meters Package Weight: 136g/4.8oz Package List: 1 * Locator (Battery Included) 1 * Data Line 1 * Clip 1 * User Manual . Note: Please note that this product is only applicable to GSM 2G network SIM card. Please confirm whether the network is compatible before purchasing.