1Bluetooth 3.0 professional chip. 21200 m Bluetooth intercom distance, up to 6 people can be connected. 3High-definition headphones, stereo sound. 4This product is durable, waterproof, sunscreen, dust-proof and with other properties. 5550 mAh lithium battery can support it standby 240 hours and call more than 8 hours. Feature: Bluetooth 3.0 professional chip. 1200 m Bluetooth intercom distance, up to 6 people can be connected. 5 groups of intercom and a mobile phone Bluetooth can be paired. High-definition headphones, stereo music. This product is durable, waterproof, sunscreen, dust-proof and with other properties. There are voice prompts and it can automatically answer the call. 550 mAh lithium battery can support it standby 240 hours and call more than 8 hours. With radio function and can working when charging. Handheld walkie-talkie can be connected via wired and wireless connection. Specification: Bluetooth version: 3.0 Chip: CSR BC5 Battery capacity: 550 Battery type: polymer Charge and discharge times: 500 Working voltage: 3.3V-4.2V Call time: 8H Standby time: 300H Charging time: 2.5H Radio frequency band: none RDS: None Speaker power: 0.25W waterproof level: With or without TTS: None With or without automatic volume adjustment: none Operating temperature range: -10to 45 Package List:XD08260-01:1xHost1xInstruction manual1xclip1xUSB data line1xScrew packages1xHeadphones1xScrewdrivers2xPastesXD08260-02: 2 xHost1 xInstruction manual2 xclips2 xUSB data line2 xScrew packages2 xHeadphones2 xScrewdrivers4 xPastes Note:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.