Sirius Satellite Radio Ursa Major Product Introduction page 7

Step 3: 打开键盘，解开排线（建议解开 PCB 位置的接口）
Open the keyboard and unlock the cable
(recommended to unlock the interface at the PCB side)
NOTE: 由于运输要求， 海外版不含电池 （诺基亚 BL5J*2） ， 需自行购买。
Due to the transportation requirements, the overseas version does not
include batteries (Nokia BL5J * 2), which should be purchased locally
电池小板固定（沉头内六角 M2*4 ~M2*16）
(countersunk hex socket screw M2 * 4~M2 * 6)
配重固定（沉头内六角 M2*3 ~M2*4）
(countersunk hex socket screw M2 * 4~M2 * 4)